We have seen war affecting God's people since the very first book of the Bible.
When marauding kings captured his nephew, Abram sent his army to rescue Lot and those captured with him (Genesis 14:14). Abram ordered his army to attack at night without warning. In the battle that followed he routed his enemies and rescued the captives.
When Abram returned from battle, Melchizedek, priest of the Most High God, attributed Abram's victory to God. "Blessed be God Most High," he says, "who delivered your enemies into your hand" (Genesis 14:19). He has no condemnation for what Abram has done.
"After this, the word of the Lord came to Abram in a vision. ‘Do not be afraid, Abram. I am your shield" (Genesis 15:1). Following this military metaphor, God made his covenant with Abram, promising that his many descendants would possess Canaan.
Deuteronomy 25:18 tells us that the Amalekites struck those who were weary and therefore lagging behind the main body of Israelites. These would have included the infirm, the elderly and families with young children. Without hesitation, Moses ordered Israel to strike back. Joshua led their army. Thus, the future commander of the army that would invade Canaan gained valuable battle experience.
As long as someone held up Moses' arms, Israel was winning. When his arms dropped, the Amalekites gained the advantage. The battle lasted until sunset, with Israel victorious (Exodus 17:10-13). After the battle, God spoke. He had no moral condemnation. Nothing to teach Israel. No lesson to be learned. No correction given. He wanted the battle's story to be recorded and he promised that he, the Lord, would be at war with the Amalekites from generation to generation (verses 14–17).
Joshua and Judges. Both books relate the holy wars of Israel in the period between the death of Moses and the establishment of the monarchy.
Jos.6 The walls of Jericho. Jos 10 Battle of Gibeon showed God physically helping with hailstones and the sun standing still.
Judg6-7 Gideon's Battle God made him reduce the army from 32000 to 300 and routed an army of 135,000.
Judges 13-16 Sampson and the Philistines one of the best known stories of the bible.
Among the great warriors of Israel was David. Tens of millions of children have heard how he slew the giant Goliath.
After becoming king, David warred to unite the nation and to fight Israel's neighbors.
2Kings6 Elisha against the Army of Syria God provided an army of Angels.
2kings 19 the angel of the Lord put 185,000 Assyrians to death in one night.
2Chr.20 The Battle of Jehoshaphat an entire army is defeated with Songs of Praise.
Book of Esther. Queen Esther saves all the Jews.
In Deuteronomy 20, God gave laws regulating warfare.
Romans 13 1-4
As Abram became the father of the faithful, one other point may prove important for Christian ethics. Abram was willing to suffer loss for the sake of peace. Genesis 13 tells how Abram gave up the greenest pastures in exchange for peace between his servants and Lot's servants. Yet peace was not his highest ethic. When Lot and his neighbors in Sodom suffered from invasion, Abram's army went to battle to rescue them. The men of Sodom were wicked; Lot may have been greedy, but Lot was kin, and Lot's friends were the victims of an invading army. By going to war, Abram again proved his willingness to suffer loss for another's benefit.
So maybe the turn the other cheek is supposed to be applied to use in our personal situations but maybe not necessarily when other people are in danger.
Look also in Rev. Doesn't Jesus himself leads an army to war?
