In 1996, U.S. Surgical launched a hostile takeover bid against Circon Corp. CEO Richard Auhll recruited an old HBS friend, George Cloutier, to the Circon board to help him defend the company. Circon's primary defenses include a "poison pill" and a staggered board and lead to the longest-running takeover battle in U.S. corporate history. This is an abridged version of an earlier case.