can you take more than one stronghold by combat per turn?

Say my opening hand is 3 reanimate and 1 gold. could I buy a reanimate, play a reanimate, reanimate, capture. Play,reanimate, capture, play, reanimate capture and get all 3 on one turn?

I have been playing that I can not do this due to the attack a target only once rule. I figured the stronghold pile counts as a target, but I was not sure.

I assume you could buy one and take one by combat?

I think you can do that. At least, that's how I understand the rules.