Firing rockets and rifles, Taliban militiamen attacked American and Afghan military outposts in a daylong siege on Saturday that killed eight U.S. soldiers and two Afghan security forces in one of the deadliest battles in months, according to U.S. and Afghan officials.

The fighting began early Saturday morning and raged throughout the day in a remote region of eastern Afghanistan in Nurestan province, which borders Pakistan. Staging their attack from steep mountainsides that overlook the outposts in the valley below, on a morning when weather made visibility poor, the Taliban fighters attacked the small American and Afghan bases using rifles, machine guns, grenades and rockets, according to U.S. military officials.