It was in no spirit of recklessness then that Warwick resolved to cross into Kent in the last week of June, with every man that could be spared from Calais. As a preliminary to his advance, he had resolved to clear away the only Lancastrian force that was watching him--a body of five hundred men-at-arms which had been sent down to Sandwich, to replace Lord Rivers' troops and to endeavour to communicate with Somerset at Guisnes. This body was commanded by Osbert Mundeford, one of the officers of the Calais garrison who had deserted Warwick in company with Sir Andrew Trollope.
Accordingly, on June 25th Sir John Dynham, the captor of Rivers, sailed over to Sandwich for the second time, and fell on Mundeford's force. There was a hot skirmish, for on this occasion the Lancastrians were not caught sleeping; but again the Yorkists won the day. Dynham indeed was wounded by a shot from a bombard, but his men stormed the town, routed the enemy, and took Mundeford prisoner. He was sent over to Calais, where he was tried for deserting his captain, as the prisoners of November 3rd had been, and beheaded next day outside the walls.
On the 27th Warwick himself, his father, the Earl of March, Lord Fauconbridge, Wenlock, and the rest of the leaders at Calais, crossed over to Sandwich with two thousand men in good array, leaving in the town the smallest garrison that could safely be trusted with the duty of keeping out Somerset. They had published before their landing a manifesto, which set out the stereotyped Yorkist grievances once more--the weak government, the crushing taxes, the exclusion of the King's relatives from his Council, the diversion of the revenue into the pockets of the courtiers, the misdoings of individual Lancastrian chiefs, the oppression of the King's lieges, and all the other customary complaints.
The three Earls had only been in Sandwich a few hours when, as had been agreed, the Archbishop of Canterbury came to join them with many of the tenants of the see arrayed in arms. They then moved forward, with numbers increasing at every step, for the Kentishmen came to meet them by thousands, and no one raised a hand against them.
The Lancastrians had been caught wholly unprepared. They seem to have been expecting raids from Warwick on the eastern coast, not on the southern, and except Mundeford's routed force there was no one in arms south of the Thames. The King and Queen were at Coventry, and most of the Lancastrian lords scattered each in their own lands. Lord Scales and Lord Hungerford were in command of London, where there were present a few other notables--Lord Vesey, Lord Lovell, and John de Foix titular Earl of Kendal. These leaders endeavoured to fortify the city, posting guns on London Bridge and placing their retainers in the Tower. But the aspect of the citizens was threatening, and Warwick was known to be coming on fast. The landing had taken place on the 27th, and on July 1st the three Earls and the Archbishop of Canterbury were already before the walls of London. They had marched over seventy miles in four days, taking the route of Canterbury, Rochester, and Dartford, and were at hand long before they were expected.