Start with 4 players with contact shields standing next to each other facing 4 other players 2m away at the bottom of the channel. A scrumhalf stands behind the group with no shields. Lie a tackle bag down a few meters away to the side with a ball behind it. Drill starts with the 4 players driving into the shields pushing them back a few meters. Both groups immediately run to attack and defend the far side of the tackle bag. The scrumhalf makes the pass from the base and the defenders come up to defend a 5v4 situation where the attackers try to beat the defence on the outside with quick hands.