SECURITIES AND EXCHANGE COMMISSION

                             WASHINGTON, D.C. 20549



                                  SCHEDULE 13G/A
                    UNDER THE SECURITIES EXCHANGE ACT OF 1934
                                (AMENDMENT NO.7)

                             ARCH CAPITAL GROUP LTD.
                         ------------------------------
                                (NAME OF ISSUER)

                     COMMON STOCK, $.01 PAR VALUE PER SHARE
                   -------------------------------------------
                         (TITLE OF CLASS OF SECURITIES)

                                    G0450A105
                          ----------------------------
                                 (CUSIP NUMBER)

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

[ ]  Rule 13d-1(b)

[ ]  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 in 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).






- --------------------------------------------------------------
  1   NAME OF REPORTING PERSONS
      S.S. OR I.R.S. IDENTIFICATION NOS. OF ABOVE PERSONS

      EQSF ADVISERS, INC.
      (EIN 13-3354359)

- --------------------------------------------------------------
- --------------------------------------------------------------
  2   CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP*
       (a)  [   ]

       (b)  [   ]
- --------------------------------------------------------------
- --------------------------------------------------------------
  3   SEC USE ONLY

- --------------------------------------------------------------
- --------------------------------------------------------------
  4   CITIZENSHIP OR PLACE OF ORGANIZATION

                  NEW YORK CORPORATION

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

                           1,172,400
   NUMBER OF
                 ---------------------------------------------
                 ---------------------------------------------
     SHARES        6  SHARED VOTING POWER
  BENEFICIALLY
    OWNED BY               NONE
                 ---------------------------------------------
                 ---------------------------------------------
      EACH         7  SOLE DISPOSITIVE POWER
   REPORTING
     PERSON                1,203,500

                 ---------------------------------------------
                 ---------------------------------------------
      WITH        8   SHARED DISPOSITIVE POWER

                           NONE
- --------------------------------------------------------------
- --------------------------------------------------------------
 9    AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING
      PERSON

           1,203,500

- --------------------------------------------------------------
- --------------------------------------------------------------
 10   CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES
      CERTAIN SHARES*
             [    ]

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

           7.69%

- --------------------------------------------------------------
- --------------------------------------------------------------
 12     TYPE OF REPORTING PERSON*

           IA

- --------------------------------------------------------------




- --------------------------------------------------------------
  1   NAME OF REPORTING PERSONS
      S.S. OR I.R.S. IDENTIFICATION NOS. OF ABOVE PERSONS

      M.J. WHITMAN ADVISERS, INC.
      (EIN 13-3686379)

- --------------------------------------------------------------
- --------------------------------------------------------------
  2   CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP*
       (a)  [   ]

       (b)  [   ]
- --------------------------------------------------------------
- --------------------------------------------------------------
  3   SEC USE ONLY

- --------------------------------------------------------------
- --------------------------------------------------------------
  4   CITIZENSHIP OR PLACE OF ORGANIZATION

                  NEW YORK CORPORATION

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

                           1,144,355
   NUMBER OF
                 ---------------------------------------------
                 ---------------------------------------------
     SHARES        6  SHARED VOTING POWER
  BENEFICIALLY
    OWNED BY               NONE

                 ---------------------------------------------
                 ---------------------------------------------
      EACH         7  SOLE DISPOSITIVE POWER
   REPORTING
     PERSON                1,223,405

                 ---------------------------------------------
                 ---------------------------------------------
      WITH        8   SHARED DISPOSITIVE POWER

                                    NONE
- --------------------------------------------------------------
- --------------------------------------------------------------
 9    AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING
      PERSON

           1,223,405
- --------------------------------------------------------------
- --------------------------------------------------------------
 10   CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES
      CERTAIN SHARES*
             [    ]

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

           7.82%
- --------------------------------------------------------------
- --------------------------------------------------------------
 12      TYPE OF REPORTING PERSON*

           IA
- --------------------------------------------------------------




- --------------------------------------------------------------
  1   NAME OF REPORTING PERSONS
      S.S. OR I.R.S. IDENTIFICATION NOS. OF ABOVE PERSONS

           MARTIN J. WHITMAN


- --------------------------------------------------------------
- --------------------------------------------------------------
  2   CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP*
       ( a)  [   ]

       (b)   [   ]
- --------------------------------------------------------------
- --------------------------------------------------------------
  3   SEC USE ONLY

- --------------------------------------------------------------
- --------------------------------------------------------------
  4   CITIZENSHIP OR PLACE OF ORGANIZATION

           USA

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

   NUMBER OF               NONE  (SEE ITEM 4)
                 ---------------------------------------------
                 ---------------------------------------------
                   6  SHARED VOTING POWER
     SHARES
                           NONE
  BENEFICIALLY
    OWNED BY     ---------------------------------------------
                 ---------------------------------------------
      EACH         7  SOLE DISPOSITIVE POWER
   REPORTING               NONE  (SEE ITEM 4)

                 ---------------------------------------------
                 ---------------------------------------------
  PERSON WITH     8   SHARED DISPOSITIVE POWER

                           NONE
- --------------------------------------------------------------
- --------------------------------------------------------------
 9    AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING
      PERSON

           -0-    (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 (11)

           -0-

- --------------------------------------------------------------
- --------------------------------------------------------------
 12   TYPE OF REPORTING PERSON*

           IN

- --------------------------------------------------------------
ITEM 1.

     (A) NAME OF ISSUER:
         ---------------
         Arch Capital Group Ltd. (the "Issuer").

     (B) ADDRESS OF ISSUER'S PRINCIPAL EXECUTIVE OFFICES OR, IF NONE, RESIDENCE:
         -----------------------------------------------------------------------
         20 Horseneck Lane, Greenwich, CT 06830
ITEM 2.

     (A) NAME OF PERSON FILING:

         This schedule is being jointly filed by EQSF Advisers,  Inc.
("EQSF"),   M.J.  Whitman  Advisers,  Inc.  ("MJWA")  and  Martin  J.
Whitman,   the  Chief   Executive   Officer  of  EQSF  and  Chief
Investment Officer of MJWA  and controlling person  of EQSF and MJWA.
(EQSF,  MJWA and  Martin  J. Whitman  are  sometimes   collectively
referred  to  hereinafter  as "Filer").  Attached  hereto  as an
exhibit is a copy of the  joint Schedule 13G filing agreement among
the reporting persons.

     (B) ADDRESS OF PRINCIPAL BUSINESS OFFICE:
         -------------------------------------
         The address of the principal  executive office of EQSF, MJWA
         and Mr. Whitman is:  767 Third Avenue, New York, New York 10017-2023.

     (C) CITIZENSHIP:
         ------------
         The  citizenship  or place  of  organization  of each of the  reporting
         persons is as follows:

         EQSF
         ----
         New York State Corporation.

         MJWA
         ----
         New York State Corporation.

         MARTIN J. WHITMAN
         -----------------
         United States Citizen.

     (D) TITLE OF CLASS OF SECURITIES:
         -----------------------------
         Common Stock, $.01 par value per share.

     (E) CUSIP NUMBER:
         -------------
         G0450A105

ITEM 3.IF THIS STATEMENT IS BEING FILED PURSUANT TO RULES 13D-1(B), OR 13D-2(B),
CHECK WHETHER THE PERSON FILING IS A:

         (E) Investment  Adviser  registered under section 203 of the INVESTMENT
             ADVISERS ACT OF 1940 (EQSF AND MJWA).

ITEM 4.  OWNERSHIP.

     (a)  & (b)EQSF beneficially owns 1,203,500 shares, or 7.69% of the class of
          securities of the issuer.  MJWA beneficially owns 1,223,405 shares, or
          7.82% of the class of securities of the issuer.

     (c)   (i) EQSF: 1,172,400
               MJWA: 1,144,355

          (ii) Not applicable.

         (iii) EQSF: 1,203,500
               MJWA: 1,223,405

          (iv) Not applicable.

     Mr. Whitman disclaims beneficial ownership of all such shares.

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.

     Third Avenue Value Portfolio of the WRL Series Fund, an investment  company
registered  under the  Investment  Company Act of 1940, has the right to receive
dividends  from,  and the  proceeds  from  the sale of,  285,900  of the  shares
reported  by EQSF,  Third  Avenue  Variable  Series  Trust of the  Third  Avenue
Variable  Portfolio,  an  investment  company  registered  under the  Investment
Company Act of 1940, has the right to receive  dividends  from, and the proceeds
from the sale of,  113,100 of the shares  reported by EQSF,  Third  Avenue Value
Fund, an investment company registered under the Investment Company Act of 1940,
has the right to receive  dividends  from,  and the  proceeds  from the sale of,
432,300,  of the shares reported by EQSF,  Third Avenue Small-Cap Value Fund, an
investment  company registered under the Investment Company Act of 1940, has the
right to receive dividends from, and the proceeds from the sale of, 251,100,  of
the shares reported by EQSF, Sun America Style Select Small Cap Value Series,
an investment company  registered  under the Investment  Company Act of 1940,
has the right to receive dividends from, and the proceeds from the sale of,
40,000, of the shares reported by EQSF,  Integrity Life/Legends Third Avenue
Value Fund, an investment company registered under the Investment Company Act of
1940, has the right to receive dividends from, and the proceeds from the sale
of, 50,000 of the shares reported by EQSF, American Express Partners Variable
Annuity Fund, an investment company registered under the Investment Company Act
of 1940, has the right to receive dividends from, and the proceeds from the sale
of, 13,500 of the shares reported by EQSF, and American Express Partners Small-
Cap Value  Fund an  investment company  registered  under  the Investment
Company Act of 1940, has the right to receive dividends from, and the proceeds
from the sale of,  17,600,  of the shares  reported  by EQSF.  Various clients
for whom MJWA acts as  investment advisor  have the right to  receive dividends
from, and the proceeds of the sale of, the shares reported by MJWA.

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 I  certify  that,  to the best of my  knowledge  and
belief, the securities referred to above were acquired in the ordinary course of
business  and were not acquired for the purpose of and do not have the effect of
changing or  influencing  the control of the issuer of such  securities and were
not acquired in connection  with or as a participant in any  transaction  having
such purposes or effect.





                                    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.

                                 February 5, 2002
                                 --------------------------------
                                 (Date)




                                 EQSF ADVISERS, INC.

                                 BY:/S/ MARTIN J. WHITMAN
                                 ------------------------
                                 Martin J. Whitman
                                 Chairman and Chief Executive Officer

                                 M.J. WHITMAN ADVISERS, INC.

                                 BY:/S/  MARTIN J. WHITMAN
                                 ----------------------
                                 Martin J. Whitman
                                 Chairman and Chief Investment Officer

                                 /S/  MARTIN J. WHITMAN
                                 -----------------------
                                 Martin J. Whitman, President