"It is strange that any should interpret this as speaking of Jesus’ sufferings on the cross, yet that is how many interpreters view it. The cross, however, does not reveal warfare, but the great love, reconciliation, and redemption of God in Christ! Furthermore, in the scene above it is not His own blood that is shed in weakness and in meekness and in sacrifice, but the blood of foes trampled in wrath. He is on His way to battle! And “every battle of the warrior is with confused noise and garments rolled in blood” (Isa. 9:5). The language is symbolic, of course. Jesus does not wield a literal sword of steel; His sword is the sword of the spirit, which is the word of God. He does not go out physically killing multitudes of people, and soaking His garment with their blood. Rather, His warfare is spiritual, He slays the enemies within man, which appear as the man, but are not the man that God intends. Oh, yes! He slays men, but it is the natural man — the human consciousness, the carnal mind, the ego, self-will, lust, deception, fear, rebellion, bondage, and every sin of the old Adamic man. Wielding His powerful sword of the spirit He comes upon the world of natural, carnal-minded, sinning men, and He comes to judge and to make war! His flaming eyes picture to us the holy passion that burns in His bosom at this moment, now that He is ready to subdue the earth and establish His righteous kingdom in the hearts of all men everywhere!"
Much more spiritual warfare in the link:
"It seems that, usually, we are ready to do almost anything but surrender ourselves to God. I recall the time when the British general came to surrender to Washington. The general began with a flowery speech in which he praised Washington for his magnificent military tactics and the way he had conducted the campaigns. He was eloquently praising Washington when Washington suddenly interrupted him with these words: “Your sword, sir!” Similarly we come to offer God the flattery of our lips, the praise of our hymns. And God is saying to us, “Your sword, sir!” Surrender is what God wants! Total surrender of all our will, our ways, and our lives! It is, in fact, during the process of conquering us and taking from us our fleshly sword that His garment becomes soaked with blood! But, praise His name, He will conquer us, take our fleshly sword, conscript us, retrain us in the ways and tactics of spiritual warfare, and raise us up to ride with Him in His army. Oh, the wonder of it!"