jimbursch

Hello -- new to 0ad so have a couple basic questions. Couldn't find answers in the manual. Buildings appear to have two status bars. One is clearly a hit points bar, but what is the other? Sometimes when I send units to attack a building, they all just gather around the building and waive at it in some sort of worship. What are they doing? Also, one time I encountered a bolt thrower, and whenever I sent units to attack it, they turned treasonous. What happened? Were they bribed or put into some hypnosis that made them convert?