Edward Foord, The Invasions of England
“ From the neighbourhood of Canterbury to that of London the Romans advanced slowly, probably along the line of the later Watling Street, while Caswallon moved parallel to them in the woods, hung about the line of march, and harassed it incessantly. The Gallic horsemen never dared to move far from the infantry columns. Caswallon was ever watchful. But it was not guerrilla warfare, however skilful and gallant, that could stay the march of Cæsar’s legions. The advance was slow and difficult, but still it continued steadily until the Thames was reached. ”
