Luke 22:49

And when they that were about him saw what would follow, they said, Lord, shall we smite with the sword? And a certain one of them smote the servant of the high priest, and struck off his right ear.

The apostles had misunderstood the Lord's mention of the sword, and that misunderstanding led to the incident here. The sword was a proper weapon of self-defense against brigands, but not against the lawful authority. Such was the Saviour's respect for the legal government that he willingly submitted to it, even when it was controlled by evil men engaged in an illegal and shameful project.

And a certain one of them smote ... Peter was not named here as the one who used the sword; and from this it must be assumed that when Luke wrote this gospel, Peter was still alive, discretion demanding that his name be withheld. Tertullian stated that Peter was crucified by Nero (37-68 A.D.); and here is a telling argument for the early date of the gospel of Luke. Whether or not Tertullian's statement is received as true, there is no reasonable way to date Peter's death after the reign of Nero. John, writing long afterward, did not hesitate to name Peter, and from this is it certain that considerations of Peter's safety required the omission of his name here.