Struggling to fend off a dissident proxy challenge, Compass Bancshares has enlisted the aid of some big Wall Street guns.

Birmingham, Ala.-based Compass confirmed that it had hired Wachtell, Lipton, Rosen & Katz for legal advice and CS First Boston Corp. as its investment banker. Compass will use both firms to fend off a challenge led by director Harry B. Brock Jr.

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