Hi,
maybe, someone already reported this bug, so I'm sorry in this case.
One quite funny event happened to me. I played for Baccus Empire and I got prison break quest. We were in war with D'Shar and the prisoner (unfortunately, I forgot his name) was imprisoned in Saidu Sharif castle. After "fighting my way out" I killed prisoner guard and went to a prison cells. I told that lord to not fight. When we went out to a courtyard, the lord started attack me with castle guards, but castle guards attacked him too. So I killed these guards and thought it's enough. It wasn't. The lord still attacked me and I was able to leave the castle only after I knocked him out (the note on the left was green like when killing ENEMIES). Yeah, it was totally unique fight in Warband, in which were fighting three sides
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I tried it several times and mostly the guards knocked the lord out before I had to do it myself. But nothing has changed. Then I tried to free Marius Imperator from Sher Quila castle and the same story has happened. Yeah, it was irritating, sad and funny at the same time
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BTW trying to break into various cities or castles is pretty unbalanced – in some it's almost impossible, in some it's quite easy because of hidden alleys etc. But yes, in reality it works in the same way
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And sorry for my horrible english.