The Duke of Hamilton, a shuffling Jacobite, had been in constant correspondence with the Court of S. Germain's, and with the numerous agents of the Pretender kept scattered about in various parts of the Continent and in England. Even before Mrs. Masham and Harley had undermined the Whig ministry, Hamilton had been an acceptable visitor at the Court of S. James's; but since the Tory party had got the upper hand, he had been closeted far more frequently with the Queen than before; and now he was appointed to represent Queen Anne at the French Court. Burnet says: "The Duke of Hamilton being now appointed to go to the Court of France gave melancholy speculation to those who thought him much in the Pretender's interest; he was considered, not only in Scotland, but here in England, as the head of his party." A few days before he left for Versailles, his career was cut short. He had been engaged in some law-suits with Lord Mohun over the succession to the estates of the Earl of Macclesfield, and this, together with political animosity, inflamed both these noblemen with deadly hatred towards each other. Mohun took an occasion that offered of publicly insulting the Duke, in the hope of making him the challenger. His Grace, however, had too much contempt for the known character of the man to enter into an idle dispute with him, especially at a time when he was invested with the sacred character of ambassador. He relied on his own reputation with the world to bear him out in declining to notice such an affront, offered at such a time, and committed, as the Tories asserted, under the influence of drink.

The circumstances of the insult were these. On Thursday, November 13th, a party was assembled at the chambers of Mr. Orlebar, a master in Chancery, when the Duke made some reflections on Mr. Whitworth, father of the Queen's late ambassador to the Czar; whereat Lord Mohun roared out that the Duke had neither truth nor justice in him. "Indeed, he has just as much truth in him as your Grace!" The Duke of Hamilton made no reply; and both parties remained at the table for half an hour after this outbreak; and at parting Hamilton made a low bow to Mohun, who returned the civility, so that none of those there present suspected any consequence from what had passed between the two peers.

But Lord Mohun had determined to fight his private and political adversary, and although he was the offender he next day sent a challenge to the Duke by the hand of a friend, General Maccartney. In the evening of the 14th the Duke, accompanied by Colonel John Hamilton, went to meet General Maccartney at the Rose Tavern, in one room, whilst in the adjoining Lord Mohun awaited Colonel Hamilton. Then and there the time and place of the duel were agreed upon. On Sunday morning, November 15th, at seven o'clock, Lord Mohun with his second, General Maccartney, went in a hackney-coach to the lodge of Hyde Park, where they alighted, and were soon after met by the Duke of Hamilton and his second, Colonel Hamilton. They all jumped over a ditch into a place called the Nursery. It is said that Lord Mohun did not wish that the seconds should bear a part in the engagement, but the Duke insisted, saying that "Mr. Maccartney should have a share in the dance." But the spirit of party so completely seized hold of the subject as to make it difficult to ascertain what were the real facts.

It is said on one side that the Duke was from the first very unwilling to fight, and even at the last moment would have consented to a reconciliation. According to the evidence given by Colonel Hamilton at the inquiry on November 25th, early in the morning of the 15th, before he was half dressed, the Duke called at his house and hurried him into his chariot "so soon that he finished the buttoning of his waistcoat there. By the time they had got into Pall Mall the Duke observed that the Colonel had left his sword behind him; whereupon he stopt his chariot and gave the footman a bunch of keys and orders to fetch a mourning sword out of such a closet. At the return of the footman they drove on to Hyde Park, where the coachman stopt, and the Duke ordered him to drive on to Kensington. When they came to the lodge they saw a hackney-coach at a distance, on which his Grace said, 'There was some body he must speak with'; but driving up to it and seeing nobody he asked the coachman, 'Where the gentlemen were whom he had brought?' he answered 'A little before.' The Duke and the Colonel got out in the bottom and walked over the pond's head, where they saw the Lord Mohun and General Maccartney before them. As soon as the Duke came within hearing he said, 'He hop'd he was come time enough,' and Maccartney answered, 'In very good time, my Lord.' After this they all jumped over the ditch into the Nursery, and the Duke turned to Maccartney and told him, 'Sir, you are the cause of this, let the event be what it will.' Maccartney said, 'We'll have our share.' Then the Duke answered, 'There is my friend then, he will take his share in my dance.'"

THE DUEL BETWEEN LORD MOHUN AND THE DUKE OF HAMILTON
From a contemporary mezzotint in the British Museum

The Duke is said to have looked about him and remarked to his second, "How grey and cold London looks this morning, and yet the sky is almost cloudless." To which the Colonel replied, "It is through lack of London smoke. London is nothing without its smoke."

The combat then commenced between the principals, and at a little distance from them between the seconds.

The combat between the former was carried on with fury, and the clash of steel called to the spot the keepers of the Park and a few stragglers who were abroad there at this early hour—in all about nine or ten. None of them interfered; they looked on as they might at a cock-fight.