I think you have him confused with a group of christian missionaries that were in Afghanistan and held prisoner by the Taliban at the start of the operations after Sept 11. They were held as bargaining chips but eventually freed.

John Walker Lindh is the punk that was among a group of Taliban/al Qaeda fighters captured up north and imprisoned at Mazar-e Sharif. They revolted. In the process a USGOV employee, Mike Spann, and a number of our anti-taliban allies were killed.

Walker Lindh was amongst a group of die hards that refused to surrender. After they gave up, it was discovered that he was an American.

-Scott