 Of the petroleum stocked for the offensive, much of it was released to units operating along the front, fighting against American and British actions in the Lorraine and around Aachen.Some were supposed to be accumulated for the first days of the offensive, in the hope that much more would be captured by the advance; by early December less than were available, and only around were available by the start of the offensive.Furthermore, initial fuel consumption estimates were incorrect because they had not taken into account the increase in fuel consumption which resulted from movement over the terrain of the Ardennes, including the snow.