Our strategy was to have 4 guys below the regency stairs. They protected the stairway and had plenty of boomshields. I was above the regency balcony running the heavy weapons. I didn’t have to get ammo once during all 50 waves because I used the Hammer of Dawn and the mortar. I also used the Magnum and the Lancer which regenerate ammo every wave.

Every 10th wave was strictly sires. It was pretty easy to chainsaw them all down even on wave 50. I think those waves were the easiest waves. It was definitely fun.

More info on the Horde Labor Day Event.