If my life were on the line, yes sir. If it truly comes down to his life or my life, then his life goes.
The Bible makes it clear that we have a right to defend ourselves. I think I know where this is going but I will wait for you to follow-up with more details or another question.
EDIT: Yes, I rather thought that is what the question was leading to. If you mean to imply some sort of parallel between defending your life on the spot and engaging in carnal warfare, certainly we can see some key factors are being overlooked. I will not go into any discussion regarding carnal warfare engaged in by one particular country, particularly as respects its invasion of another country. I will say, however, that first-century Christians left us a model to follow and we should consider closely just what that model was. First-century Christians were neutral as to politics and this is undisputed. And they most assuredly did not engage in any sort of carnal warfare, though they had good reason. One need only consider their lives under the hated yoke of the Roman Empire, complete with its savagery, slavery and Christians as live torches to light the arena by night to know this.
But what scriptures bear on this attitude of true Christians regarding carnal warfare? At Matthew 26:52, Jesus instructed his disciple to return his weapon to its place. Surely no greater reason existed than to fight for the Messiah. Yet, Jesus told them not to resort to such weapons of physical warfare.
At 2 Corinthians 10:3,4 the apostle Paul was inspired to write that "we do not wage warfare according to what we are in the flesh . . . the weapons of our warfare are not fleshly." At Luke 6:27, 28, Jesus commanded us to continue to love our enemies. Do we rightly say that resorting to bloodshed and warfare is a manifestation of love for our enemies? What about serving in the armed forces? Do we rightly say that invading another country is loving our enemies?
What does history have to say as respects the Christian attitude toward carnal warfare? "A careful review of all the information available goes to show that, until the time of Marcus Aurelius [Roman emperor from 161 to 180 C.E.], no Christian became a soldier; and no soldier, after becoming a Christian, remained in military service." The Rise of Christianity (London, 1947), E. W. Barnes p. 333.
"They refused to take an active part in the civil administration or the military defence of the empire . . . it was impossible that the Christians, without renouncing a more sacred duty, could assume the character of soldiers, of magistrates, or of princes." History of Christianity (New York, 1891), Edward Gibbon, pp. 162-163.
People certainly have the right to self-defense; particularly where their life or the life of a loved one is on the line. Even coming to the aid of a stranger to save his life if it is threatened is acceptable. But by no means can this right be used to justify carnal warfare for Christians.
Hannah J Paul
The Rise of Christianity (London, 1947), E. W. Barnes p. 333.
History of Christianity (New York, 1891), Edward Gibbon, pp. 162-163.