A trio of banks led by Royal Bank of Scotland PLC said Monday it would rebid $97.8 billion for ABN Amro Holding NV, as the group went on the offensive in the largest takeover battle in the history of the financial industry.

The proposed bid of $52.87 per share, mostly in cash, would be worth at least 10 percent more than an all-share rival bid by Barclays PLC, RBS and its partners said.