PCs deploy in the top left corner. REGRET makes their appearance by walking out of the rubble of the destroyed building near the top right, inside the destroyed wall. In my campaign, it has already been established that one of the buildings in the bottom left is home to NPC Bolt Fitgerald, who one of the PCs met and became friendly with.

My group of PCs knew to scan REGRET right away, but they didn't realize they needed to use Invade/Fragment Signal until far too late in the fight. As a result, REGRET wiped the floor with them, then took out both the inner wall and Bolt's building with its self-destruct. Most of the fight happened near the road on the north side of the map, away from any potentially interesting incidental Hellfire Projector attacks on buildings. It would have been better to put more of the small structure in the area between where the PCs and enemies start. My PCs didn't have much of a chance to avoid civilian casualties anyway. Instead of heading back to Evergreen, they went to go investigate the ruins of Stable Reactor 1 after defending Stable Reactor 2, which gave REGRET's group time to start the battle with two objective buildings already leveled.
