If you don't have a defensive arm, sell your clothes and get one.
I believe that is Christ said. Sell your cloak and buy a sword.
For the time period, that was the state of the art for personal defensive arms that can be easily carried on the person.
The Apostle Peter had a sword and used it to defend Jesus in the Garden of Gethsemane, when the Jews came to arrest him. In an an attempt to cut off a man's head, it appears the intended victim ducked, just in time, to keep from having his head severed from his shoulders, and "only" had his ear cut off!.
