2 players will attack 1 defender. After a shot has been taken all 3 players become offence and 2 defenders will run in to play a 3v2 at the other end.
Once a shot has been taken at that end. The 2 defenders become offence and 1 defender will run in at the other end.
This is a continuous drill, where each end the same thing will happen each time.
Make sure players on the wings run wide, so that the have a good angle to attack once they receive the ball.
2-3 passes should be the maximum number of passes to get a good shot in this drill. Remember in a real game you will have 4 or 3 more defenders running back on defence as well.