When I attack with my units in a city, ie select them all inside the city and attack something outside the city, I get very weird results. Each unit has to fight on its own, but each unit also gets the combat dialogue. So if I have a hero, a soldier and a summoned being, and I attack outside the town, I will get 3 combat dialogues.
I think this was present way back in beta 2 as well. It's probably been reported many times, but it's still there, so here we are.