The Warriors

This mission is the last one in the story which, incidentally, lets you play out the finale of the movie. The mission involves throwing projectiles at the enemy from cover and is not terribly difficult. Follow the instructions and use the mechanics that you've learned in game thus far to complete it.

Will not pop until the credits have finished

Fun tip: as the credits are rolling, you will see another gang beating up on the enemy gang, you can actually take control of them and beat them up yourself to pass the time.