Devers' headquarters remained subordinate to AFHQ during the invasion and in the weeks immediately afterwards while operational control of the troops on the ground resided with Patch until his forces linked near Dijon, France with Twelfth United States Army Group's Third Army advancing from the west after breaking out of the Normandy beachhead. At this time, on 15 September, Devers' headquarters was designated Sixth Army Group to take operational control of Seventh Army and French Army B and came under the overall command of General Dwight D. Eisenhower, the Supreme Commander at SHAEF (Supreme Headquarters, Allied Expeditionary Forces).