'War' in the Bible

Then you answered and said to me, "We have sinned against Yahweh, we will go up and fight, according to all that Yahweh our God commanded us." Every man of you put on his weapons of war, and presumed to go up into the hill country.

The days in which we came from Kadesh Barnea, until we were come over the brook Zered, were thirty-eight years; until all the generation of the men of war were consumed from the midst of the camp, as Yahweh swore to them.

So it happened, when all the men of war were consumed and dead from among the people,

Or has God tried to go and take him a nation from the midst of [another] nation, by trials, by signs, and by wonders, and by war, and by a mighty hand, and by an outstretched arm, and by great terrors, according to all that Yahweh your God did for you in Egypt before your eyes?

If it will make no peace with you, but will make war against you, then you shall besiege it:

When you shall besiege a city a long time, in making war against it to take it, you shall not destroy its trees by wielding an axe against them; for you may eat of them, and you shall not cut them down; for is the tree of the field man, that it should be besieged of you?

Only the trees of which you know that they are not trees for food, you shall destroy and cut them down; and you shall build bulwarks against the city that makes war with you, until it fall.