The next recorded battle of Slack was for 100 guineas with Cornelius Harris, a collier of Kingswood, near Bristol. It took place on the 13th of March, 1755. The skill and tactics of Slack were severely tried, Harris fighting desperately in Slack’s own early style for twenty minutes, when he gave in. On October 20th, 1759, Slack is again recorded as victor in a fight for £50 aside with one Moreton, who had issued a challenge to the champion. It came off at Acton Wells. Moreton proved himself a courageous, if not a good boxer; but at the end of thirty-five minutes he acknowledged his mistake. Ten years had now elapsed since Slack had vanquished the renowned Broughton, and held the title of champion—but the honour was dazzling, and another hero put in his claim for the towering prize. Slack’s fame was well established; and here royalty once more appeared on the pugilistic scene; for Broughton’s old patron, the Duke of Cumberland, stepped forward and backed Slack for £100 against Bill Stevens, the Nailer, whom the Duke of York took under his patronage. The Haymarket was the scene of action, and a stage was erected in the Tennis Court, James Street, on the day of the 17th of June, 1760. Slack entered the field with all the confidence of a veteran, and was acknowledged to have the advantage in the first part of the battle; but the Nailer, with an arm like iron, received the ponderous blows of his antagonist on his left with ease, while with his right arm he so punished the champion’s nob, that he knocked off the title, picked it up, and wore it. Thus fell the hitherto invincible Slack. This second great mistake of William of Cumberland seems to have disgusted him with the ring, and we hear no more of him. The Duke of York here spoken of was one of the uncles of George III., whose father, Frederick, Prince of Wales, died in George II.’s lifetime.