In this book Joshua led the invation by the Israelies of the land called Canaan which is now Israel and Palestine. He did a nifty trick of circling the city of Jericho for 7 days then blowing some horns and the city walls fell murdering everyone in them. He succeeds in taking over the whole place. Eventually he dies and a generation later all the Israelies forget about him and start worshiping other gods. God god gets jelous and lets other nations start invading the Israelies until they have to start worshiping God god again and he helps them kill all the invaders. This happens several times, apparantly the memory of these people is only one generation long. Samson is probably the most famous of the leaders during the strange phase. He gets his super powers from his hair and stupidly tells his wife that who then tells the invading philistines who chop it all off. Then he kills them all by collapsing a temple on them. Charming.
One day the Israelies are really distrustful of God god and they decide they need a King, so God god gives them a King who was called Saul. Saul gets superhero powers and goes around causing genocide on anyone who isn’t Israelie. Except that during one genocide he decides to spare some sheep and causing God to get mad and take away his superhero powers and make some dude called David King instead.