Well, I suppose when you consider the speed of the advance across Europe and the problems with getting supplies to forward units it is less surprising. Consider the situation before Market Garden, Generals vying to be the main effort so that they could have sufficient supplies to actually advance. I think the real surprise is that the US went to the effort of forming a unit specifically to use German artillery rather than soldiers just making the most of what they captured.

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There's no honorable way to kill, no gentle way to destroy. There is nothing good in war. Except its ending.