[NTJedi]

Originally Posted by Mysterio

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.

It's only logical that a castle under siege won't allow any enemy troops to just walk inside. On the same note the castle under siege won't allow any enemy troops to walk out of the castle unharmed.