'War' in the Bible

Now thirty-eight years passed from the time we left Kadesh-barnea until we crossed the Zered Valley, until that entire generation of the men of war had died from within the camp, just as the Lord had sworn to them.

“So it came about when all the men of war had finally died from among the people,

“Then I commanded you [Reuben, Gad, and the half-tribe of Manasseh] at that time, saying, ‘The Lord your God has given you this land to possess; all you who are brave men shall cross over [the Jordan] armed before your brothers, the sons of Israel.

Or has any [man-made] god ever tried to go and take for himself a nation from within another nation by trials, by signs and wonders and by war and by a mighty hand and by an outstretched arm and by great terrors, as the Lord your God did for you in Egypt before your [very] eyes?

“When you besiege a city for a long time, making war against it in order to capture it, you shall not destroy its [fruit-bearing] trees by swinging an axe against them; for you may eat from them, and you shall not cut them down. For is the tree of the field a man, that it should be besieged (destroyed) by you?

Only the trees which you know are not fruit trees shall you destroy and cut down, so that you may build siegeworks against the city that is making war with you until it falls.