Narrative - Official Air Force Mission Description
In France, bombing by P-47s is inaugurated by the VIII Fighter Command in an attack on Saint-Omer airfield by the 56th and 353d Fighter Groups; two other fighter groups, the 55th (P-38s) and 352d (P-47s), carry out offensive sweeps in the Lille area; the fighters, including 2 escorting groups, fly over 330 offensive sorties.
The 401st Bombardment Group (Heavy) reaches operational status, making 22 heavy bomber groups now operational in the Eighth Air Force.
The 712th and 713th Bombardment Squadrons (Heavy), 448th Bombardment Group (Heavy), arrive at Seething, England from the US with B-24s. They will fly their first mission on 22 Dec.
Source: THE ARMY AIR FORCES IN WORLD WAR II: COMBAT CHRONOLOGY, 1941-1945 by Carter / Mueller, the Office of Air Force History,