Every year, "end times" and apocalyptic films, books, and articles are produced in both the wider popular culture, and in religious contexts. In almost every post-disaster scenario as typically portrayed in media productions, riots, mobs, and an every-man-for-himself setting is typically envisaged.
As Christians, we know God will take care of us and that whatever happens is for His glory.
For those of us who are married or have children, we have been entrusted, as husbands, to care for our wives, and, as parents, to guard, train, and raise our children in a God-honoring way.
From another question, I believe it has been established that a Christian is free to serve in the military to the limit of their conscience (ie, the Bible neither proscribes, nor prescribes the activity).
Just before He was betrayed, Jesus told his disciples to make sure they had swords to bring with them (they had two).
In the broader context of scripture, what should make up a Christian response to self-defense, and of defending the defenseless?
What passages of the Bible support (or preclude) such action? and to what limit (if any) is that action to not exceed?