I think being sieged is probably the worse option. Being the defending side in a siege generally accompanies local force inferiority. If they do take the fortress, things will suck a lot for you.
I think a better formulation might be:
When one army is assaulting a fortress, and the other defending, try to be in neither of them.
It’s a paraphrase from a discworld general. He also said "on preventing defeat when you are outnumbered, out matched, poorly supplied and in poor position: “don’t have a war”
I think being sieged is probably the worse option. Being the defending side in a siege generally accompanies local force inferiority. If they do take the fortress, things will suck a lot for you.
I think a better formulation might be: When one army is assaulting a fortress, and the other defending, try to be in neither of them.
It’s a paraphrase from a discworld general. He also said "on preventing defeat when you are outnumbered, out matched, poorly supplied and in poor position: “don’t have a war”