Alternately, this could be the liaison with the locals and the resistance that was spoken of in several accounts of the campaign. The locals had better knowledge of the best roads to use to move armor, etc. and of the specific deployments of Germanicon units. According to the accounts I've read, the Britishicon weren't generally comfortable using local knowledge but the US forces were. Specifically, the 101st utilized the British SOE Jedburgh team "Daniel II" and, on a tactical level, made contact with individuals that they vouched for and used their knowledge to adjust their tactics to fit the situation on the ground. It made a difference in outcomes in some cases.

Bob