A bulldozer is a crawling powerhouse, a behemoth of noise and toughness, the nearest thing to the famous irresistible force. The beginner, awed and with the pictures of unconquerable Army tanks printed on his mind from the newsreels, takes all in his stride and with a sense of limitless power treats all obstacles alike, not knowing the fragility of a cast-iron radiator core, the mortality of tempered manganese, the friability of over-heated babbitt, and most of all, the ease with which a tractor can bury itself in mud.
