One team attacks and the other defends.
The attacking team will stay on the attack until the defending team carries the ball, under control, over the half way line.
At that moment the defending team becomes the attacking team and vice versa.
The team crossing the half way line should try and turn and attack very quickly to make the most of the other team being out of position.
Team will need to learn how to quickly reorganise themselves to prevent the other team from scoring.