However, the plan had been based on the misinterpretation of reconnaissance intelligence, which had concluded that the main line of German resistance was behind Cisterna. In fact, the Wehrmacht had designated Cisterna as an assembly area for its reserve divisions and had begun moving units into the area. Although a Polish conscript in the German Army had deserted to the U.S. lines immediately before the attack, warning of the buildup, the message was not relayed promptly and the attack proceeded as planned.
