Turning up the heat in his battle to regain control of Compass Bancshares, former chairman Harry B. Brock Jr. has disclosed that First Union Corp. made a confidential offer last fall for the $9.1 billion-asset company.

The disclosure, in a filing with the Securities and Exchange Commission, is part of Mr. Brock's campaign to replace three of Compass' 12 board members with his own nominees through a proxy challenge - a move he believes will give him a six-vote majority.

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