Usar "fatigue duty" en una oración

1. He recalled his former companions: how wretched they were; they rose at dawn, and toiled until night; hardly were they permitted to sleep; they lay on camp beds, where nothing was tolerated but mattresses two inches thick, in rooms which were heated only in the very harshest months of the year; they were clothed in frightful red blouses; they were allowed, as a great favor, linen trousers in the hottest weather, and a woollen carter's blouse on their backs when it was very cold; they drank no wine, and ate no meat, except when they went on "fatigue duty