I don't understand why there are 5 artillery icons on the scenario sheet. The rules say that each attempt to use artillery costs 3 Operations points, and the Germans only have a range of 3-5. So how could the Germans ever make more than 1 artillery attempt per turn?
Operations range is how many units you can activate before the enemy get to activate some of his, not how many you can activate in a turn total.
So when the germans have activatet artillery, and let initiative pass to the americans and the americans let initiative pass back, germans can activate another artillery.