u/LeMinoursdu21

Pretty much what the title says. I'm at war with almost all my vassals because they want to put someone else on the throne, they have five times my manpower so my only chance to win is to imprison leaders. I took the city where the enemy leader is but I didn't take him prisonner. He is still in the city and I can't imprison him because "I'm at war with him". Does anyone know if this is normal?