Peter cut an ear off one of the men who came to arrest Jesus.
Perter was again putting his actions into play before thinking of the consequences.
What was thinking he was surrounded by a lot of armed soldiers.
Jesus once again calms the situation for His hot headed friend Peter.
Peter uses a sword
49 When Jesus' followers saw what was going to happen, they said, "Lord, should we strike with our swords?" 50 And one of them struck the servant of the high priest, cutting off his right ear.
51 But Jesus answered, "No
more of this!" And he touched the man's ear and healed him.
Also read: Matthew 26:51-54, Mark 14:44-47, John 18:10-11
Peter was a fisherman not a soldier, he was the brother of Andrew another of Jesus' disciples.