You have two sides, one out in the field and one in. Each player who’s in the side that’s in goes out, and when he’s out he comes in, and the next player goes in until he’s out. Once all the players who are in are out, the side that’s out comes in, the side that’s in goes out and tries to get those coming in out. Two umpires stay out all the time, they decide when the players who are in are out. When both sides have been in and out twice, and all the players who are in are out, including those who are not out, that’s the end of the game.