When, according to the Bible, is a war justified? In what instances in the Bible did God command Israel to go to war? Is war ever necessary, biblically speaking?

Links:

What does the Bible say about war? - https://www.gotquestions.org/war-Bible.html

What is the just war theory? - https://www.gotquestions.org/just-war-theory.html

Is religion the cause of most wars? - https://www.gotquestions.org/religion-war.html