December 18th ends after seeing pockets of heavy fighting and the struggle of both sides to move men and machines where they are needed most. Battle lines have solidified on the northern and southern shoulders of the 'bulge' but the Germans have punched a hole in the Allied center.
The race to Bastogne was 'won' by the Allies but a hard push by the Germans saw their Panzers in the outskirts of town as darkness fell. Elements of the 2d Panzer Division also manage to capture the lightly defended town of Houffalize, seriously jeopardizing the north/south movement of Allied reserves. The 101st and 82nd airborne divisions are enroute via trucks but the whether they will be committed to hold Bastogne or take up a defensive line further west is still to be determined.
St. Vith is still in Allied hands but the Germans have cut if off and if no breakthrough occurs to relieve the beleaguered defenders then they will almost certainly surrender. The Germans are coordinating a major attack on Malmedy in order to occupy troops that would otherwise try to breakthrough to St. Vith.