Well, that's one way to turn your offensive into a success. Redefine the objectives halfway through so that a city you held at the start is now the target.
As for the actual objective, it's pretty undoable. The Bulge offensive was a failure pretty much from the word go, even by the end of the first day, it was massively behind schedule and had achieved very little. Even if the Germans somehow get an 'auto-win' button from startline to Antwerp, they're left holding a corridor which the Allies can and will counterattack. Hell, it might be even more of a disaster than OTL if more troops are caught.