 The decisive victory at Ulm is also believed to be a product of the long training and preparation the Grande Armée received at the camps of Boulogne.The Grande Armée carried little baggage, invaded enemy territory at harvest time, and marched far faster than the Austrians had expected.The campaign highlighted the utility of the "Corps d'Armée" system; corps went on to become the fundamental strategic building block for the major wars in the nineteenth and twentieth centuries.