On the same day that Senator McCain faced off with General Myers , more than 100 people were killed in a series of car bombs in a town north of Baghdad ; five U.S. soldiers were killed by a roadside bomb in Ramadi ; and the American general in charge of U.S. forces in Iraq , George Casey , admitted before the Armed Services Committee that only 1 of the Iraqi Army 's 86 battalions was capable of fighting the insurgency without American help .