After he mounted a one-man charge on an enemy stronghold which resulted in the solo capture of eight enemy soldiers, his unit was again attacked by a machine gun placement across another minefield. Herrera again that day single-handedly took on the enemy. While crossing the second minefield, he lost one of his legs to a land mine explosion then the other leg to a second explosion. Unable to continue his 1-man advance and despite a severe loss of blood, he single-handedly held the forward position to provide covering fire pinning down the enemy with his M1 Garand. His accurate rifle fire allowed his comrades to overrun the enemy position in a flanking action clear of the minefield.