'War' in the Bible

Now these are the nations which the LORD left, to test Israel by them, that is, all in Israel who had no experience of any war in Canaan;

it was only that the generations of the people of Israel might know war, that he might teach war to such at least as had not known it before.

The Spirit of the LORD came upon him, and he judged Israel; he went out to war, and the LORD gave Cu'shan-rishatha'im king of Mesopota'mia into his hand; and his hand prevailed over Cu'shan-rishatha'im.

When new gods were chosen, then war was in the gates. Was shield or spear to be seen among forty thousand in Israel?

After a time the Ammonites made war against Israel.

And when the Ammonites made war against Israel, the elders of Gilead went to bring Jephthah from the land of Tob;

Now are you any better than Balak the son of Zippor, king of Moab? Did he ever strive against Israel, or did he ever go to war with them?

I therefore have not sinned against you, and you do me wrong by making war on me; the LORD, the Judge, decide this day between the people of Israel and the people of Ammon."

And six hundred men of the tribe of Dan, armed with weapons of war, set forth from Zorah and Esh'ta-ol,

Now the six hundred men of the Danites, armed with their weapons of war, stood by the entrance of the gate;

and the five men who had gone to spy out the land went up, and entered and took the graven image, the ephod, the teraphim, and the molten image, while the priest stood by the entrance of the gate with the six hundred men armed with weapons of war.

And the men of Israel, apart from Benjamin, mustered four hundred thousand men that drew sword; all these were men of war.