The quoted route turns Roman expansion into a problem of terrain, water, and organized movement. Vespasian sent the governor Petillius Cerialis north with the Ninth Legion, which moved from its fortress at Lincoln toward York. The main force is traced through Doncaster, Castleford, and Tadcaster, following the Magnesian Limestone ridge and then slightly raised ground on the York moraine. Other troops may have followed Ermine Street and crossed the Humber, but tides and hazards in the estuary made that approach difficult. The section ends by stressing that soldiers and camp followers transformed the area's population as well as its military geography.
Notable Point · 16:18-17:37
How the Roman army approached York
Petillius Cerialis and the Ninth Legion's movement from Lincoln toward York followed forts, limestone ridges, river crossings, and a difficult Humber alternative.