Thomas Miller, History of the Anglo-Saxons, from the Earliest Period to the Norman Conquest
“ It was not until the commencement of the third century, when old and gouty, and compelled to be borne at the head of his army in a litter, that the Emperor Severus determined to conquer the Caledonians, and boldly sallied out for that purpose beyond the northern frontier. His loss was enormous, and between war with the natives, and the wearisome labour in making roads, felling forests, and draining marshes, which had hitherto been impassable to the Roman troops, fifty thousand soldiers were sacrificed. ”
