UNITED STATES
                       SECURITIES AND EXCHANGE COMMISSION
                             Washington, D.C. 20549


                                  SCHEDULE 13G

                    Under the Securities Exchange Act of 1934
                                (Amendment No.)*

                       NAVISTAR INTERNATIONAL CORPORATION
--------------------------------------------------------------------------------
                                (Name of Issuer)

                     Common Stock, Par Value $0.10 Per Share
--------------------------------------------------------------------------------
                         (Title of Class of Securities)

                                    63934E108
                                    ---------
                                 (CUSIP Number)

                                  June 24, 2008
                                  -------------
                      (Date of Event which Requires Filing
                               of this Statement)



Check the appropriate box to designate the rule pursuant to which this Schedule
is filed:

                  [ ]      Rule 13d-1(b)
                  [X]      Rule 13d-1(c)
                  [ ]      Rule 13d-1(d)



  *The remainder of this cover page shall be filled out for a reporting person's
  initial filing on this form with respect to the subject class of securities,
  and for any subsequent amendment containing information which would alter the
  disclosures provided in a prior cover page.

  The information required on the remainder of this cover page shall not be
  deemed to be "filed" for the purpose of Section 18 of the Securities Exchange
  Act of 1934 ("Act") or otherwise subject to the liabilities of that section of
  the Act but shall be subject to all other provisions of the Act (however, see
  the Notes).







---------------------------                                  -------------------
CUSIP No. 63934E108                      13G                 Page 2 of 11 Pages
---------------------------                                  -------------------

---------- ---------------------------------------------------------------------
        1  NAME OF REPORTING PERSON
           I.R.S. IDENTIFICATION NO. OF ABOVE PERSON

           S.A.C. Capital Advisors, LLC
 ---------- --------------------------------------------------------------------
        2  CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP*
                                                                   (a) [ ]
                                                                   (b) [X]
---------- ---------------------------------------------------------------------
        3  SEC USE ONLY
---------- ---------------------------------------------------------------------
        4  CITIZENSHIP OR PLACE OF ORGANIZATION

           Delaware
--------------------- ----- ----------------------------------------------------
                         5  SOLE VOTING POWER

                            0
                      ----- ----------------------------------------------------
                         6  SHARED VOTING POWER
NUMBER OF SHARES
BENEFICIALLY OWNED          2,503,400 (see Item 4)
BY EACH REPORTING     ----- ----------------------------------------------------
PERSON WITH              7  SOLE DISPOSITIVE POWER

                            0
                      ----- ----------------------------------------------------
                         8  SHARED DISPOSITIVE POWER

                            2,503,400 (see Item 4)
---------- ---------------------------------------------------------------------
        9  AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON

           2,503,400 (see Item 4)
---------- ---------------------------------------------------------------------
       10  CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN SHARES

           [ ]
---------- ---------------------------------------------------------------------
       11  PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (9)

            3.6% (see Item 4)
---------- ---------------------------------------------------------------------
       12  TYPE OF REPORTING PERSON*

           00
---------- ---------------------------------------------------------------------
                       *SEE INSTRUCTION BEFORE FILLING OUT

                                  Page 2 of 11





---------------------------                                  -------------------
CUSIP No. 63934E108                      13G                 Page 3 of 11 Pages
---------------------------                                  -------------------

---------- ---------------------------------------------------------------------
        1  NAME OF REPORTING PERSON
           I.R.S. IDENTIFICATION NO. OF ABOVE PERSON

           S.A.C. Capital Management, LLC
 ---------- --------------------------------------------------------------------
        2  CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP*
                                                                   (a) [ ]
                                                                   (b) [X]
---------- ---------------------------------------------------------------------
        3  SEC USE ONLY
---------- ---------------------------------------------------------------------
        4  CITIZENSHIP OR PLACE OF ORGANIZATION

           Delaware
--------------------- ----- ----------------------------------------------------
                         5  SOLE VOTING POWER

                            0
                      ----- ----------------------------------------------------
                         6  SHARED VOTING POWER
NUMBER OF SHARES
BENEFICIALLY OWNED          2,503,400 (see Item 4)
BY EACH REPORTING     ----- ----------------------------------------------------
PERSON WITH              7  SOLE DISPOSITIVE POWER

                            0
                      ----- ----------------------------------------------------
                         8  SHARED DISPOSITIVE POWER

                            2,503,400 (see Item 4)
---------- ---------------------------------------------------------------------
        9  AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON

           2,503,400 (see Item 4)
---------- ---------------------------------------------------------------------
       10  CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN SHARES

           [ ]
---------- ---------------------------------------------------------------------
       11  PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (9)

            3.6% (see Item 4)
---------- ---------------------------------------------------------------------
       12  TYPE OF REPORTING PERSON*

           00
---------- ---------------------------------------------------------------------
                       *SEE INSTRUCTION BEFORE FILLING OUT

                                  Page 3 of 11





---------------------------                                  -------------------
CUSIP No. 63934E108                      13G                 Page 4 of 11 Pages
---------------------------                                  -------------------

---------- ---------------------------------------------------------------------
        1  NAME OF REPORTING PERSON
           I.R.S. IDENTIFICATION NO. OF ABOVE PERSON

           CR Intrinsic Investors, LLC
 ---------- --------------------------------------------------------------------
        2  CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP*
                                                                   (a) [ ]
                                                                   (b) [X]
---------- ---------------------------------------------------------------------
        3  SEC USE ONLY
---------- ---------------------------------------------------------------------
        4  CITIZENSHIP OR PLACE OF ORGANIZATION

           Delaware
--------------------- ----- ----------------------------------------------------
                         5  SOLE VOTING POWER

                            0
                      ----- ----------------------------------------------------
                         6  SHARED VOTING POWER
NUMBER OF SHARES
BENEFICIALLY OWNED          870,400 (see Item 4)
BY EACH REPORTING     ----- ----------------------------------------------------
PERSON WITH              7  SOLE DISPOSITIVE POWER

                            0
                      ----- ----------------------------------------------------
                         8  SHARED DISPOSITIVE POWER

                            870,400 (see Item 4)
---------- ---------------------------------------------------------------------
        9  AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON

           870,400 (see Item 4)
---------- ---------------------------------------------------------------------
       10  CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN SHARES

           [ ]
---------- ---------------------------------------------------------------------
       11  PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (9)

            1.2% (see Item 4)
---------- ---------------------------------------------------------------------
       12  TYPE OF REPORTING PERSON*

           00
---------- ---------------------------------------------------------------------
                       *SEE INSTRUCTION BEFORE FILLING OUT

                                  Page 4 of 11






---------------------------                                  -------------------
CUSIP No. 63934E108                      13G                 Page 5 of 11 Pages
---------------------------                                  -------------------

---------- ---------------------------------------------------------------------
        1  NAME OF REPORTING PERSON
           I.R.S. IDENTIFICATION NO. OF ABOVE PERSON

           Walter Capital Management, LLP
 ---------- --------------------------------------------------------------------
        2  CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP*
                                                                   (a) [ ]
                                                                   (b) [X]
---------- ---------------------------------------------------------------------
        3  SEC USE ONLY
---------- ---------------------------------------------------------------------
        4  CITIZENSHIP OR PLACE OF ORGANIZATION

           England and Wales
--------------------- ----- ----------------------------------------------------
                         5  SOLE VOTING POWER

                            0
                      ----- ----------------------------------------------------
                         6  SHARED VOTING POWER
NUMBER OF SHARES
BENEFICIALLY OWNED          156,650 (see Item 4)
BY EACH REPORTING     ----- ----------------------------------------------------
PERSON WITH              7  SOLE DISPOSITIVE POWER

                            0
                      ----- ----------------------------------------------------
                         8  SHARED DISPOSITIVE POWER

                            156,650 (see Item 4)
---------- ---------------------------------------------------------------------
        9  AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON

           156,650 (see Item 4)
---------- ---------------------------------------------------------------------
       10  CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN SHARES

           [ ]
---------- ---------------------------------------------------------------------
       11  PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (9)

            0.2% (see Item 4)
---------- ---------------------------------------------------------------------
       12  TYPE OF REPORTING PERSON*

           00
---------- ---------------------------------------------------------------------
                       *SEE INSTRUCTION BEFORE FILLING OUT

                                  Page 5 of 11




---------------------------                                  -------------------
CUSIP No. 63934E108                      13G                 Page 6 of 11 Pages
---------------------------                                  -------------------

---------- ---------------------------------------------------------------------
        1  NAME OF REPORTING PERSON
           I.R.S. IDENTIFICATION NO. OF ABOVE PERSON

          Steven A. Cohen
 ---------- --------------------------------------------------------------------
        2  CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP*
                                                                   (a) [ ]
                                                                   (b) [X]
---------- ---------------------------------------------------------------------
        3  SEC USE ONLY
---------- ---------------------------------------------------------------------
        4  CITIZENSHIP OR PLACE OF ORGANIZATION

           United States
--------------------- ----- ----------------------------------------------------
                         5  SOLE VOTING POWER

                            0
                      ----- ----------------------------------------------------
                         6  SHARED VOTING POWER
NUMBER OF SHARES
BENEFICIALLY OWNED          3,530,450 (see Item 4)
BY EACH REPORTING     ----- ----------------------------------------------------
PERSON WITH              7  SOLE DISPOSITIVE POWER

                            0
                      ----- ----------------------------------------------------
                         8  SHARED DISPOSITIVE POWER

                            3,530,450 (see Item 4)
---------- ---------------------------------------------------------------------
        9  AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON

           3,530,450 (see Item 4)
---------- ---------------------------------------------------------------------
       10  CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN SHARES

           [ ]
---------- ---------------------------------------------------------------------
       11  PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (9)

            5.0% (see Item 4)
---------- ---------------------------------------------------------------------
       12  TYPE OF REPORTING PERSON*

           IN
---------- ---------------------------------------------------------------------
                       *SEE INSTRUCTION BEFORE FILLING OUT

                                  Page 6 of 11




Item 1(a)           Name of Issuer:
                    --------------

                    Navistar International Corporation

Item 1(b)           Address of Issuer's Principal Executive Offices:
                    -----------------------------------------------

                    4201 Winfield Road, P.O. Box 1488,
                    Warrenville, Illinois 60555

Items 2(a)          Name of Person Filing:
                    ---------------------

                    This statement is filed by: (i) S.A.C. Capital Advisors, LLC
                    ("SAC Capital Advisors") with respect to shares of common
                    stock, par value $0.10 per share ("Shares") of the Issuer
                    beneficially owned by S.A.C. Capital Associates, LLC ("SAC
                    Capital Associates") and S.A.C. Select Fund, LLC ("SAC
                    Select Fund"); (ii) S.A.C. Capital Management, LLC ("SAC
                    Capital Management") with respect to Shares beneficially
                    owned by SAC Capital Associates and SAC Select Fund; (iii)
                    CR Intrinsic Investors, LLC ("CR Intrinsic Investors)" with
                    respect to Shares beneficially owned by CR Intrinsic
                    Investments, LLC ("CR Intrinsic Investments"); (iv) Walter
                    Capital Management, LLP ("Walter Management") with respect
                    to Shares beneficially owned by S.A.C. Global Investments,
                    L.P. ("Global Investments") and (v) Steven A. Cohen with
                    respect to Shares beneficially owned by SAC Capital
                    Advisors, SAC Capital Management, SAC Capital Associates,
                    SAC Select Fund, CR Intrinsic Investors, CR Intrinsic
                    Investments, Walter Management and Global Investments.

                    SAC Capital Advisors, SAC Capital Management, CR Intrinsic
                    Investors, Walter Management and Steven A. Cohen have
                    entered into a Joint Filing Agreement, a copy of which is
                    filed with this Schedule 13G as Exhibit 99.1, pursuant to
                    which they have agreed to file this Schedule 13G jointly in
                    accordance with the provisions of Rule 13d-1(k) of the
                    Securities Exchange Act of 1934, as amended.


Item 2(b)           Address of Principal Business Office:
                    ------------------------------------

                    The address of the principal business office of (i) SAC
                    Capital Advisors, CR Intrinsic Investors and Mr. Cohen is 72
                    Cummings Point Road, Stamford, Connecticut 06902, (ii) SAC
                    Capital Management is 540 Madison Avenue, New York, New York
                    10022 and (iii) Walter Management is St. Martins Court, 4th
                    Floor, 10 Paternoster Row, London EC4M 7HP, U.K.

                                  Page 7 of 11




Item 2(c)           Citizenship:
                    -----------

                    SAC Capital Advisors, SAC Capital Management and CR
                    Intrinsic Investors are Delaware limited liability
                    companies. Mr. Cohen is a United States citizen. Walter
                    Management is limited liability partnership organized under
                    the law of England and Wales.

Item 2(d)           Title of Class of Securities:
                    ----------------------------

                    Common Stock

Item 2(e)           CUSIP Number:
                    ------------

                    63934E108

Item 3              Not Applicable

Item 4              Ownership:
                    ---------

                    The percentages used herein are calculated based upon the
                    Shares issued and outstanding as of April 30, 2008 as
                    reported on the Issuer's quarterly report on Form 10-Q filed
                    with the Securities and Exchange Commission by the Company
                    for the quarterly period ended April 30, 2008.

                    As of the close of business on June 30, 2008:

                    1. S.A.C. Capital Advisors, LLC
                    (a) Amount beneficially owned: 2,503,400
                    (b) Percent of class: 3.6%
                    (c)(i) Sole power to vote or direct the vote: -0-
                    (ii) Shared power to vote or direct the vote: 2,503,400
                    (iii) Sole power to dispose or direct the disposition: -0-
                    (iv) Shared power to dispose or direct the disposition:
                         2,503,400

                    2. S.A.C. Capital Management, LLC
                    (a) Amount beneficially owned: 2,503,400
                    (b) Percent of class: 3.6%
                    (c)(i) Sole power to vote or direct the vote: -0-
                    (ii) Shared power to vote or direct the vote: 2,503,400
                    (iii) Sole power to dispose or direct the disposition: -0-
                    (iv) Shared power to dispose or direct the disposition:
                         2,503,400

                    3. CR Intrinsic Investors, LLC
                    (a) Amount beneficially owned: 870,400

                                  Page 8 of 11



                    (b) Percent of class: 1.2%
                    (c)(i) Sole power to vote or direct the vote: -0-
                    (ii) Shared power to vote or direct the vote: 870,400
                    (iii) Sole power to dispose or direct the disposition: -0-
                    (iv) Shared power to dispose or direct the disposition:
                         870,400

                    4. Walter Capital Management, LLP
                    (a) Amount beneficially owned: 156,650
                    (b) Percent of class: 0.2%
                    (c)(i) Sole power to vote or direct the vote: -0-
                    (ii) Shared power to vote or direct the vote: 156,650
                    (iii) Sole power to dispose or direct the disposition: -0-
                    (iv) Shared power to dispose or direct the disposition:
                         156,650

                    5. Steven A. Cohen
                    (a) Amount beneficially owned: 3,530,450
                    (b) Percent of class: 5.0%
                    (c)(i) Sole power to vote or direct the vote: -0-
                    (ii) Shared power to vote or direct the vote: 3,530,450
                    (iii) Sole power to dispose or direct the disposition: -0-
                    (iv) Shared power to dispose or direct the disposition:
                         3,530,450

                    SAC Capital Advisors, SAC Capital Management, CR Intrinsic
                    Investors, Walter Management and Mr. Cohen own directly no
                    Shares. Pursuant to investment management agreements, each
                    of SAC Capital Advisors and SAC Capital Management share all
                    investment and voting power with respect to the securities
                    held by SAC Capital Associates and SAC Select Fund. Pursuant
                    to an investment management agreement, CR Intrinsic
                    Investors maintains investment and voting power with respect
                    to the securities held by CR Intrinsic Investments. Pursuant
                    to an investment management agreement, Walter Management
                    maintains investment and voting power with respect to the
                    securities held by Global Investments. Mr. Cohen controls
                    each of SAC Capital Advisors, SAC Capital Management, CR
                    Intrinsic Investors and indirectly owns a 49% interest in
                    the managing member of Walter Management. CR Intrinsic
                    Investments is a wholly-owned subsidiary of SAC Capital
                    Associates. By reason of the provisions of Rule 13d-3 of the
                    Securities Exchange Act of 1934, as amended, each of (i) SAC
                    Capital Advisors, SAC Capital Management and Mr. Cohen may
                    be deemed to own beneficially 2,503,400 Shares (constituting
                    3.6% of the Shares outstanding), (ii) CR Intrinsic Investors
                    and Mr. Cohen may be deemed to own beneficially 870,400
                    Shares (constituting approximately 1.2% of the Shares
                    outstanding) and (iii) Walter Management and Mr. Cohen may
                    be deemed to own beneficially 156,650 shares (constituting
                    approximately 0.2% of the Shares outstanding). Each of SAC
                    Capital

                                  Page 9 of 11



                    Advisors, SAC Capital Management, CR Intrinsic Investors,
                    Walter Management and Mr. Cohen disclaim beneficial
                    ownership of any of the securities covered by this statement
                    and SAC Capital Associates disclaims beneficial ownership of
                    any securities held by CR Intrinsic Investments.

Item 5              Ownership of Five Percent or Less of a Class:
                    --------------------------------------------

                    If this statement is being filed to report the fact that as
                    of the date hereof the reporting person has ceased to be the
                    beneficial owner of more than five percent of the class of
                    securities, check the following.

Item 6              Ownership of More than Five Percent on Behalf of Another
                    --------------------------------------------------------
                    Person:
                    ------

                    Not Applicable

Item 7              Identification and Classification of the
                    ----------------------------------------
                    Subsidiary Which Acquired the Security Being
                    --------------------------------------------
                    Reported on By the Parent Holding Company:
                    -----------------------------------------

                    Not Applicable

Item 8              Identification and Classification of Members
                    --------------------------------------------
                    of the Group:
                    ------------

                    Not Applicable

Item 9              Notice of Dissolution of Group:
                    ------------------------------

                    Not Applicable

Item 10             Certification:
                    -------------

     By signing below the signatory certifies that, to the best of his knowledge
and belief, the securities referred to above were not acquired and are not held
for the purpose of or with the effect of changing or influencing the control of
the issuer of the securities and were not acquired and are not held in
connection with or as a participant in any transaction having that purpose or
effect.

                                 Page 10 of 11



                                    SIGNATURE
                                    ---------

     After reasonable inquiry and to the best of my knowledge and belief, I
certify that the information set forth in this statement is true, complete and
correct.

Dated:  July 1, 2008

S.A.C. CAPITAL ADVISORS, LLC

By:     /s/ Peter Nussbaum
        -----------------------------------
Name:   Peter Nussbaum
Title:  Authorized Person


S.A.C. CAPITAL MANAGEMENT, LLC

By:     /s/ Peter Nussbaum
        -----------------------------------
Name:   Peter Nussbaum
Title:  Authorized Person


CR INTRINSIC INVESTORS, LLC

By:     /s/ Peter Nussbaum
        -----------------------------------
Name:   Peter Nussbaum
Title:  Authorized Person


WALTER CAPITAL MANAGEMENT, LLP

By:     /s/ Peter Nussbaum
        -----------------------------------
Name:   Peter Nussbaum
Title:  Authorized Person


STEVEN A. COHEN

By:     /s/ Peter Nussbaum
        -----------------------------------
Name:   Peter Nussbaum
Title:  Authorized Person

                                 Page 11 of 11