'War' in the Bible

Then ye answered and said unto me, We have sinned against Jehovah, we will go up and fight, according to all that Jehovah our God commanded us. And ye girded on every man his weapons of war, and were forward to go up into the hill-country.

And the days in which we came from Kadesh-barnea, until we were come over the brook Zered, were thirty and eight years; until all the generation of the men of war were consumed from the midst of the camp, as Jehovah sware unto them.

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

Or hath God assayed 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 Jehovah your God did for you in Egypt before your eyes?

And if it will make no peace with thee, but will make war against thee, then thou shalt besiege it:

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

Only the trees of which thou knowest that they are not trees for food, thou shalt destroy and cut them down; and thou shalt build bulwarks against the city that maketh war with thee, until it fall.