The U.S. patrol had a tip that Taliban fighters were lying in ambush, and a Marine had his weapon trained on the trees 70 yards away. "If you see anything move from there, light it up," Cpl. Braxton Russell told him.

Thirty seconds later, a salvo of gunfire and RPGs — rocket-propelled grenades — poured out of the grove. "Casualty! We've got a casualty!" someone shouted. A grenade had hit Lance Cpl. Joshua "Bernie" Bernard in the legs.