On Douglas Feith's first day as a visiting professor at Georgetown last year, he dropped in on another new professor down the hall. George Tenet, the former director of central intelligence, was friendly and welcoming, Feith recalled. Feith, who as the No. 3 at the Pentagon had served in the Bush administration with Tenet, suggested they get together for lunch.

Not long afterward, Tenet moved his office, four floors down. He told friends he wanted to be as far away as possible from Feith.

The tale of the two professors is shaping up as a reproduction in miniature of the Bush administration's titanic struggle over Iraq....

Tenet and Feith are teaching rival versions of recent history and taking their disagreements public.