About the middle of June, while the indignation of the Kentishmen was at its height, a military adventurer, who has since been known as "Jack Cade," but who called himself John Mortimer, and gave out that his mother was a Lacy, suddenly appeared among the malcontents, informed them that he was related to the Duke of York, and offered to be their captain. According to the chroniclers, he was "a young man of goodly stature, and pregnant wit," and he told his story so plausibly, that the men of Kent believed he was York's cousin. Delighted with the notion of having found a Mortimer to lead them to battle, and to free them from oppression, the people crowded by thousands to his standard; and Cade, having assumed the title of Captain of Kent, arrayed them in good order, marched toward London, and encamped on Blackheath. The men of Kent were not foes to be despised. They had ever claimed the privilege of marching in the van of England's army, and had so borne themselves on fields of fight, that their courage was beyond dispute. The determined spirit by which they were known to be animated rather daunted the court; and the king, in alarm, sent to ask why they had left their homes. Cade replied in a manner at which a government owing its existence to a revolution had little reason to take umbrage. He sent a document, entitled "Complaint of the Commons of Kent," containing a statement of grievances, demanding speedy redress, and requesting, in respectful language, the dismissal of the corrupt men by whom the king was surrounded, and the recall of "the Duke of York, late exiled from the royal presence." The queen and her friends saw that something must be done, and that quickly. An army was, therefore, levied in the king's name; and, at the head of it, Henry advanced to Blackheath; but Cade, wishing to draw the royal force into Kent, broke up his camp and retreated to the quiet old market-town of Sevenoaks. The queen, doubtless somewhat surprised at the storm she had raised, dreaded the possibility of the king being environed by the insurgents. She, therefore, deputed the danger of encountering Cade to a gallant knight named Humphrey Stafford, and, having done so, retired to Greenwich.