Well I'm not 'Mythbusters' but this one doesn't take too much thought. A 'troop' of men, - let's say a platoon, 30 men, average weight 160- total weight = 4,800+, -2 and a half TONS. Now imagine two and a half tons thumping down rythmically every 2 seconds - - then think of a dog, a big one, 120 ...