Edward was not long left in doubt as to the earl's views. At the Moor, in Hertfordshire, which then belonged to the Archbishop of York, which passed fifteen years later to John de Vere, Earl of Oxford, and which, in later days, became the seat of Anne Scott, heiress of Buccleuch and widow of the ill-fated Monmouth, George Neville, one day in the month of February, gave a banquet to the king. On the occasion Warwick and Clarence were invited; and all was going on well, and Edward was washing his hands before sitting down to supper, when one of his attendants whispered that armed men were lurking near the house to seize him. The king started, but, recovering himself sufficiently to betray no signs of alarm, he got secretly out of the house, mounted his horse, and, riding all night, reached Windsor Castle in safety.
Edward was not quite prepared to punish this attempt on his liberty. He, therefore, listened to the mediation of the Duchess of York; and that lady was laboring to effect another reconciliation, when an insurrection took place among the people of Lincolnshire. These complained bitterly of the oppression of the royal purveyors; and they were headed by Sir Robert Welles, the heir of a family remarkable for fidelity to the house of Lancaster.
Warwick was suspected to be the author of this disturbance. Nevertheless, the king found it necessary to treat the earl and Clarence as if he entertained no suspicion. He even intrusted them with the command of forces destined to suppress the insurgents, while he prepared to march against them with a numerous army.
Meanwhile, the king sent for Lord Welles, father of Sir Robert, and, at the royal summons, that nobleman came to Westminster, in company with Sir Thomas Dymoke, who had married his daughter. Being informed, however, that the king was much incensed, the Lancastrian lord and his son-in-law deemed it prudent to repair to the sanctuary. Edward, however, plighted his word as a prince, that he intended no harm, and they, fully relying on a pledge so sacred, came to his presence. Edward, thereupon, commanded Lord Welles to write to his son to desist from his enterprise; but Sir Robert continuing firm in spite of the paternal admonition, Edward caused both the old lord and his son-in-law to be executed.
After this faithless proceeding Edward left London. Marching against the insurgents, he came up with them on the 13th of March, at Erpingham, in the county of Rutland. The royal army was so superior in number that Sir Robert had scarcely a chance of victory. Exasperated, however, by the execution of his father, the brave knight, setting prudence at defiance, was eager for an encounter. The armies joined battle, and it soon appeared that Sir Robert had reckoned without his host. The conflict was utterly unequal; and, the insurgents having been worsted, their leader was taken prisoner. No sooner was Welles in the hands of the enemy than the Lincolnshire men whom he had commanded became a mob, and fled from the field, having previously thrown off their coats, that their running might not be impeded. From this circumstance the battle was popularly spoken of as "Losecote Field."
The tables were now turned. The king was in a condition to defy Warwick, while the king-maker had no means of raising such a force as could, with any chance of success, encounter the royal army flushed with victory. The earl, however, made one effort. Being at his Castle of Warwick, and hearing of Edward's victory at Erpingham, he endeavored to draw Lord Stanley, his brother-in-law, to his side. Stanley, however, was far too prudent a man to rush into danger even for his great kinsman's sake. He answered that "he would never make war against King Edward;" and Warwick and Clarence were compelled to turn toward Dartmouth.