During this prosperity of the king’s affairs his armies increased mightily in the western counties also. Sir William Waller, indeed, commanded for the Parliament in those parts too, and particularly in Dorsetshire, Hampshire, and Berkshire, where he carried on their cause but too fast; but farther west, Sir Nicholas Slanning, Sir Ralph Hopton, and Sir Bevil Grenvile had extended the king’s quarters from Cornwall through Devonshire, and into Somersetshire, where they took Exeter, Barnstaple, and Bideford; and the first of these they fortified very well, making it a place of arms for the west, and afterwards it was the residence of the queen.
At last, the famous Sir William Waller and the king’s forces met, and came to a pitched battle, where Sir William lost all his honour again. This was at Roundway Down in Wiltshire. Waller had engaged our Cornish army at Lansdown, and in a very obstinate fight had the better of them, and made them retreat to the Devizes. Sir William Hopton, however, having a good body of foot untouched, sent expresses and messengers one in the neck of another to the king for some horse, and the king being in great concern for that army, who were composed of the flower of the Cornish men, commanded me to march with all possible secrecy, as well as expedition, with 1200 horse and dragoons from Oxford, to join them. We set out in the depth of the night, to avoid, if possible, any intelligence being given of our route, and soon joined with the Cornish army, when it was as soon resolved to give battle to Waller; and, give him his due, he was as forward to fight as we. As it is easy to meet when both sides are willing to be found, Sir William Waller met us upon Roundway Down, where we had a fair field on both sides, and room enough to draw up our horse. In a word, there was little ceremony to the work; the armies joined, and we charged his horse with so much resolution, that they quickly fled, and quitted the field; for we over-matched him in horse, and this was the entire destruction of their army. For the infantry, which outnumbered ours by 1500, were now at our mercy; some faint resistance they made, just enough to give us occasion to break into their ranks with our horse, where we gave time to our foot to defeat others that stood to their work, upon which they began to disband, and run every way they could; but our horse having surrounded them, we made a fearful havoc of them.
We lost not about 200 men in this action; Waller lost about 4000 killed and taken, and as many dispersed that never returned to their colours. Those of foot that escaped got into Bristol, and Waller, with the poor remains of his routed regiments, got to London; so that it is plain some ran east, and some ran west, that is to say, they fled every way they could.