'War' in the Bible

If you go to war in your land against an adversary who opposes you, then you must sound an alarm with the trumpets, and you will be remembered before the Lord your God, and you will be saved from your enemies.

But I will bring in your little ones, whom you said would become victims of war, and they will enjoy the land that you have despised.

So Moses spoke to the people: "Arm men from among you for the war, to attack the Midianites and to execute the Lord's vengeance on Midian.

So Moses sent them to the war, one thousand from every tribe, with Phinehas son of Eleazar the priest, who was in charge of the holy articles and the signal trumpets.

But Moses was furious with the officers of the army, the commanders over thousands and commanders over hundreds, who had come from service in the war.

Then Eleazar the priest said to the men of war who had gone into the battle, "This is the ordinance of the law that the Lord commanded Moses:

Divide the plunder into two parts, one for those who took part in the war -- who went out to battle -- and the other for all the community.

The half-portion of those who went to war numbered 337,500 sheep;

Moses said to the Gadites and the Reubenites, "Must your brothers go to war while you remain here?

but your servants will cross over, every man armed for war, to do battle in the Lord's presence, just as my lord says."