 O'Connell then ordered his men to withdraw around a corner and sent two patrolmen to gain entry to the building from the rear.The rest of the squad were then marched across the street, in full view of the gang, and O'Connell approached the club once again and started an argument with Madden and Tanner.While the rest of the gang crowded around the front windows to watch their leaders taunt the police, a rear window was left unguarded allowing the two patrolmen to sneak into the building.