 South of the Ruhr River, the 1st Army's northward attack was to be executed by the XVIII Airborne Corps, which had been transferred to Hodges after Operation Varsity, and the III Corps, with the 1st Army's V and VII Corps continuing the offensive east.The 9th Army's sector of the Ruhr Pocket, although only about 1/3 the size of the 1st Army's sector south of the river, contained the majority of the densely urbanized industrial area within the encirclement.The 1st Army's area, on the other hand, was composed of rough, heavily forested terrain with a poor road network.