Tips for the Battle
Use Barry, he crafts shaped charges that do more damage than regular grenades.
When they bunch up he erases them, got the achievement for killing 5 in one round with one merc that way.
Flashbangs also work surprisingly well.
Have a couple of people with medium heavy armor up in the front corners, yeet a couple of flashbangs out the windows will lock down some of the 3omes for a round.
Setup a couple of snipers or an mg behind the altar and overwatch the front door.
Focus on cleaning out one side and send out a fast flanker to hit them from the sides (Mouse MVP)
Your corner dudes will take a couple of hits. But that’s just the price for playing.
Remember that if you are stealthed before you talk to Smiley, you peeps will be stealthed when you deploy.