A bomb exploded in the chute and shot back into the plane , severely wounding Sgt Erwin and filling the plane with heavy smoke .
Sgt Erwin was assigned to job of dropping white phosphorus bombs through a launching chute in the floor of his bomber .
A bomb exploded in the chute and shot back into the plane , severely wounding Sgt Sgt and filling the plane with heavy smoke .
Sgt Erwin was assigned to job of dropping white phosphorus bombs through a launching chute in the floor of his bomber .