In the years after WWII, the North Vietnamese/Viet Minh used bicycles very effectively, not as personnel transport, but loaded down with hundreds of pounds of supplies and pushed. They supplied their army at Dien Bien Phu that way in 1954, and they moved tons of supplies down the Ho Chi Minh Trail that way in the 1960s and 1970s.
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"I'm in shape -- round is a shape." Andy Rooney