References in classic literature ?
They went through the muddy village, past threshing floors and green fields of winter rye, downhill where snow still lodged near the bridge, uphill where the clay had been liquefied by the rain, past strips of stubble land and bushes touched with green here and there, and into a birch forest growing on both sides of the road.
He kept our feet on the smoothest part of the road, and if the uphill was very long, he set the carriage wheels a little across the road, so as not to run back, and gave us a breathing.
It is a military axiom not to advance uphill against the enemy, nor to oppose him when he comes downhill.