Castle Reinforcement

[Mysterio]

Originally Posted by Slobby

Once you are besieged you effectively lose control of the province to the enemy. What you could have done is have Army B move into the province and have Army A break siege and they would have combined forces.

The only exceptions that I'm aware of are a) if Army B was composed entirely of stealth units they can sneak into the castle b) if Army B teleported in they would come in through the lab (assuming one is there) bypassing the siegeing force.

So, once an enemy is in the province that contains your castle, all friendly units entering the province automatically engage the enemy units (with the exception of the 2 cases you listed)? I wish the manual made that clear, since I would have mobilized Army B sooner. Failing that, like you said, I would have broken the siege with Army A as Army B was entering the province.