 The main effort, SHAEF planners contemplated, was to be made by the Sixth Army Group's Seventh Army, which was to be augmented by transferring one armored and three infantry divisions from the U.S. Third Army.During the first week of March, General Devers at Sixth Army Group approved a plan (Operation UNDERTONE) prepared by General Alexander Patch′s Seventh Army.A force of three corps was to attack abreast from Saarbrücken along a sector to a point southeast of Hagenau.