Sacred Haven of Debauchery

I remember that we did something similar later on (the base was built in a different way, closer to the tower), but I don't think my brother was involved. It's strange that I forgot about it; maybe it's because we only did it a few times (perhaps around the time we got a PC). I don't remember the details very well, nor what served as the siege weapon, but we definitely inspected the damage and the dead/surviving figures. If a cube was lying on the robot, it meant it was crushed and dead. Otherwise, the outcome could be positive. In general, the inspection was the most interesting part and the main goal, because it was cool to see how and what had crushed whom (the interest was specifically in the toys, not in living creatures like insects and amphibians).
Before that, we did something similar outside, when the base was built from sand. But considering the high chance of losing toys, we quickly abandoned this idea, and it was only done a couple of times. Spoons (or something similar) were used as catapults, scooping up sand and throwing it forward.
There was also a time when I would set up toy soldiers on the floor at home, using toy cars and other objects as cover, and then shoot at them from the opposite side with a pistol. But not the one that was sold in the 90s with round pellets (although maybe a couple of times I used that one too), but with a Soviet pistol that had flat bullets with holes. It did less damage, but it was still sufficient, plus the bullets didn't fly far and were easy to collect. Besides, the round ones could fly back at you, which I guess could be considered return fire.