In a short time the Duke was wounded in both legs, and his sword pierced his antagonist through the groin, through the arm, and in sundry other parts of the body. If they had thought little enough before of attending to self-defence, they now seemed to abandon the idea altogether. Each at the same moment made a desperate lunge at the other; and the Duke's weapon passed right through his adversary's body up to the hilt. The latter, according to one account, shortening his sword, plunged it into the upper part of the Duke's left breast, the blade running downwards into his belly. But there is another version of the story.

Meanwhile the seconds had been engaged, and Colonel Hamilton deposed: "Maccartney had made a full pass at him, which he, parrying down with great force, wounded himself in the instep; however, he took that opportunity to close with and disarm Maccartney, which being done, he turn'd his head, and seeing my Lord Mohun fall, and the Duke upon him, he ran to the Duke's assistance; and that he might with the more ease help him, he flung down both swords; and as he was raising my Lord Duke up, he saw Maccartney make a push at his Grace"—this was explained to be over his shoulder—and "he immediately look'd to see if he had wounded him; but seeing no blood, he took up his sword, expecting Maccartney would attack him again; but he walked off. Just as he was gone came up the keepers and others, to the number of nine or ten, among the rest Ferguson, my Lord Duke's steward, who had brought Bassiere's man with him; who opening his Grace's breast, soon discovered a wound on the left side, which came in between the left shoulder and pap, and went slantingly down through the midriff into his belly. This wound is thought impracticable for my Lord Mohun to give him."

Maccartney now took to his heels and fled, and tarried not till he was secure in Holland.

Colonel Hamilton remained on the field, and surrendered himself to arrest.

An attempt was made to remove the Duke to the Cake House, but he expired on the grass. Lord Mohun also died on the spot.

In The Examiner, the Tory mouthpiece, the story is thus given: "The affront was wholly given by Mohun, which the Duke, knowing him to be drunk, did not resent. But the bravo Maccartney, who depended for his support on the Lord Mohun, finding his pupil's reputation very much blasted by those tame submissions, which his Lordship, mistaking his man, had lately paid to Mr. D'Avenant, judg'd there was no way to set him right in the coffee houses and the Kit-Cat but by a new quarrel, and made choice of the Duke, a person of fifty-five, and very much weaken'd by frequent attacks of gout. Maccartney was forc'd to keep up his patron's courage with wine, till within a few hours of their meeting in the field. And the mortal wound which the Duke receiv'd, after his adversary was run thro' the heart, as it is probably conjectured, could not be given by any but Maccartney. At least, nothing can be charged on him which his character is not able to bear. 'Tis known enough, that he made an offer to the late King to murder a certain person who was under his Majesty's displeasure; but that Prince disdain'd the motion, and abhorred the proposer ever after. However it be, the general opinion is that some very black circumstances will appear in this tragedy, if a strict examination be made; neither is it easy to account for three great wounds in the Duke's legs, if he had fair play."

The sum of £800 was offered by the Government for the apprehension of Maccartney.

Such would seem to be the facts, but the Colonel's statement, when brought before the Council, was somewhat rambling. In the excitement of the encounter he was not in a condition to judge accurately what took place. Cunningham, a Whig, says that Hamilton, "being challenged to a duel by the Lord Mohun, killed his antagonist; but was himself also killed, as was supposed, by General Maccartney, Mohun's second." Although the large sum mentioned was offered for the apprehension of the General, he was safe in the Low Countries. However, some years later he returned to England and was tried, but the jury gave a verdict of "Manslaughter" against him.

A prodigious ferment was occasioned by the duel, and party recriminations ran high. The stabbing of the Duke to the heart rested mainly on the allegation of Colonel Hamilton, but at the trial he prevaricated, and several persons who had seen the combat at a distance directly contradicted some material points of his testimony.