The Roman History of Ammianus Marcellinus

"[...]of war, but nevertheless had been fortified in all quarters by strong forts and garrisons, from the dread entertained by the people of rapine and slaughter, since soldiers were scattered over all the neighbouring districts. 9. Therefore hastening with all speed, in order by their exceeding celerity of movement to anticipate all rumour of their motions, trusting to their strength and activity of body, they travelled by winding roads until they reached the high ground on the tops of the mountains, the steepness of which delayed their march more than they had expected. And when at last, having surmounted all the difficulties of the mountains, they came to the precipitous banks of the Melas, a[...]".