The Laughing Cavalier by Emma Orczy

They were terribly weary hours, these last two which the soldier of fortune, the hardened campaigner had to kill before the first streak of pallid, silvery dawn would break over the horizon beyond the Zuyder Zee.

Until then it meant the keeping on the move, ceaselessly, aimlessly, in order to prevent the frost from biting the face and limbs, it meant wearily waiting in incessant, nerve-racking movement for every quarter of an hour tolled by the unseen cathedral clock; it meant counting these and the intervening minutes which crawled along on the leaden stilts of time, until the head began to buzz and the brain to ache with the intensity of monotony and of fatigue. It meant the steeling of iron nerves, the bracing of hardy sinews, the keeping the mind clear and the body warm.