Hi sorry for my little English. I have a group that play this game. One day, one player have a dude in one thing. He make a combined guns wich artillery and Calvary to enemy infantry. Enemy infantry was retreat to other hexe and he dude to advance calvary and bonus attack. ¿Can he make bonus advance and attack witch calvary in combined guns?
I think Empecinado is saying that an opponent he was playing with used a combined arms attack for his initial cavalry attack and then, when they did a breakthrough, the artillery joined the cavalry again in a combined arms attack during the bonus attack.
If that was what you were asking Empecinado, then No, it is not allowed to happen. The artillery only fire once.