Two weeks later, Doss was in battle again a few miles away from the escarpment when a Japanese grenade landed in a foxhole containing Doss and some of his patients. He attempted to kick the grenade away, but it detonated. Doss ended up with deep shrapnel lacerations all down his legs.

What happened to Doss brother in Hacksaw Ridge?

He was wounded by a grenade in the right leg as depicted in the movie. He received a sniper's bullet wound to his right arm that broke all three bones.

Why did Desmond Doss refuse to carry a weapon?

Doss refused to kill an enemy soldier or carry a weapon into combat because of his personal beliefs as a Seventh-day Adventist.