Hitman

Yeah, albeit not full (only three guys).

I had recently built the structure and had a fully manned defense tower in range, the AI literally just swarmed with melee and took it.

I don't exactly understand what the devs were going for with the capture feature. I feel that when military buildings are garrisoned they should be exempt from capture. I was playing a game and had my garrisoned entrenchment camp captured for example. It seems weird that the enemy can do that seeing that it is intended to act as a stronghold. Or am I missing the point? Also why does it require less time to capture a building then to destroy it?