Last night we played this for the first time (really solid game btw) but a question came up about the cavalry cards. You can only play wall cards on a single wall section, 1 or a group of identical cards. But I wonder if you can play cavalry cards to a different section from where you play your wall sectios during the actual action? The rulese explicitely state that during your action you must play to a single wall section, but the rules also are very explicit that the cavalry cards take place outside the "action."

Is this more clearly indicated in the original German rules?

FWIW we played that you play cavalry and/or wall cards to the same section during the same action.