What are the options with a sword?
Jesus also stops them after they say "here are two swords" by saying "that is enough".
And we're left with two choices in how to understand this.
1) Jesus is saying two swords is sufficient, though that raises the question (and this is something St. John Chrysostom even argues in his commentary), how is a group of at least twelve people supposed to defend themselves with only two swords? If Jesus is actually saying, "You only need these two swords, that is enough" then that doesn't really make any sense given the practical matters of what Jesus is talking about and the reality which the apostles and other early disciples would have found themselves in. And, more-so, it doesn't appear that aside from Peter cutting off the soldier's ear (which Jesus rebukes him for), that a sword was ever used, even in self defense.
2) Jesus is telling them that they've missed the point, "that is enough" isn't that "that is enough swords to defend yourselves with", but means something else entirely. Because, again, as soon as a sword is used--by Peter--the act is immediately condemned. Early Christians had no trouble recognizing the meaning here, Tertullian would say "In disarming Peter Jesus unbelted every soldier" ("belt" referring to the military belt Roman soldiers wore, the sign of their military oath and office). In the story of St. Marcellus the Centurion, his conversion to Christianity involved him removing his belt and rebuking his military oath--an act which, because of its public nature, ultimately got him his martyr's crown.
If taking up the sword, even in self defense, was something Jesus instructed His followers to do, then they did a very bad job at it. Because none of them--literally none of them--did it. There is a noticeable absence of Peter, James, John, or Paul going around with a sword and defending themselves from the unruly mobs. St. Stephen, the first martyr, didn't become the first martyr because he lost in combat, but defenseless he was stoned to death by a mob.
The singular example in the entire New Testament of a Christian using a weapon is also when it was rebuked directly and explicitly by Jesus Christ. And, as noted earlier, early Christians took note of that. And for centuries refused to take up arms, even in self defense. Violence had no usefulness in the ancient Church, in the time when the Church was most vulnerable. Before there were any Christian kings, emperors; there were no Christians commanding legions to battle, no crown was adorned with a cross; the Faithful were a persecuted minority. If at anytime in the history of Christianity it would have been beneficial to carry a sword for self defense, it would have been this time. But, instead, it is in this period of Christian history that is the least violent--Christians weren't wielding swords, they were having swords wielded against them.
Perhaps that means something very important, something that has gotten lost in our tradition because we, in time, came to be comfortable with power and the use of violence as not only sometimes justifiable, but even worthy and good in its own right. Perhaps it's something we should rekindle, going forward.
Perhaps we should stop relying on the principalities and powers of this present age in making our faith compulsory to some degree or another; and instead take up the apostolic mantle of peace, trusting in the power of the Gospel to itself be enough.
-CryptoLutheran