In the Southern colonies the Revolutionists and Loyalists, waged a war of extermination, the partisans on both sides, seldom gave quarter or took prisoners. At the close of the conflict in Virginia Lord Cornwallis made him a gift of a handsome sword, accompanied by a letter conferring on him the rank of Major Brevet. Whilst Coffin was attached to Cornwallis, he was able to be of great service to him, but the bravery, not to say the extraordinary sagacity mingled with audacity of one man, could not save the army. Lord Cornwallis' army cooped up in Yorktown by a superior army of French and Americans, and blockaded by a French fleet, was in danger of starvation, and Coffin stood almost alone in successful forays, in which he frequently eluded the whole American and French army, and returned laden with the fruits of his success. In one of these raids he accidentally came to the house of a wealthy planter whose daughter was to be married that day. He quietly surrounded the house with his troops and knocking at the door, sent in word that he wished to speak with the proprietor. On presenting himself, the gentleman was courteously made aware of his condition. He was told not to make any noise, but to order sufficient turkeys, ham, wine and other provisions to be put up, to satisfy his men; if this was done no harm would happen, but on the contrary, if any resistance was attempted, everything and everybody in the house would be destroyed. Coffin's character and resolution were well known, so the planter thought it best to graciously comply with the mandate. A large quantity of provisions was thus secured.
Captain Coffin supped with the wedding party, danced with the bride, and left in safety, taking care that no alarm should be given, and reached Cornwallis without accident by daylight.
Even when the enemy held Charleston, during which time he ran very great risks of being taken prisoner, he went to see Miss Ann Matthews, daughter of William Matthews, Esq., of St. John's Island, to whom he was eventually married in 1781. On the occasion of one visit, the house was searched for him by authority, and the gallant soldier took refuge under Miss Matthews' ample dress. At that time ladies wore hoops and they must have been of considerable size, when Major Coffin, who stood six feet two and was proportionately stout, could successfully conceal himself under one. At the surrender of Cornwallis at Yorktown, that portion of his army consisting of native Americans, he failed to obtain special terms for, in the articles of capitulation. He, however, availed himself of the conceded privilege of sending an armed ship northerly, without molestation, to convey away the most obnoxious of them. Major Coffin determined not to be taken by the Revolutionists who had offered $10,000 for his head, so he cut his way through the lines, and reached Charleston, attracted by the charms of Miss Matthews. When Charleston was evacuated Major Coffin made his way up to New York, crossed the Hudson, having eluded all attempts at his capture and presented himself at headquarters, to the great astonishment of his friends in the British Army. Sir Guy Carleton, Commander-in-chief, appointed him Major of the King's American Regiment, vacant by the death of Major Grant.
Previous to the evacuation of New York, and probably in view of it, Major Coffin and others who were feared and disliked by the victorious Revolutionists, and were, therefore, thrust out beyond the pale of redemption, were sent by the British Government, to New Brunswick. At twenty-seven he laid down his sword and took up his axe, accompanied by a wife delicately nurtured in a wealthy family and a warm climate, and four negroes, one woman and three men, all brought from Charleston. They arrived in October, 1783, when there were but two persons in or near the harbor of St. John. Mr. Symonds and Mr. White, fur-traders, kindly supplied the newcomers with provisions, and they immediately commenced clearing and felling timber. During the first winter they suffered great hardships, particularly Mrs. Coffin. His first mishap was the loss of his boots in crossing a swamp, now the market place of the city of St. John. Having selected some lots of ground fronting the harbor, he proceeded to explore the interior of the country. An ascent of about twelve miles up the beautiful St. John, opened out a rich and lovely landscape-hill and dale, magnificent woods, rivers and lakes, swarming with game and fish.
In this fine and fertile locality Major Coffin purchased for a trifle a tract of land from Colonel Grazier, to whom it had been granted by Government. Four men were sent up there to build a house, and in the following May, 1784, he and his wife and four black servants, took possession of their new residence, and called it Alwington Manor, after the family estate in Devonshire, which belonged to them in the time of William the Conqueror. Two of the men, and the woman, proved to be good and faithful servants, and when the slaves were emancipated, still remained with the family.
Settlers soon flocked into the province. Ten years' residence, with Major Coffin's activity, aided by his willing men, made it a respectable and desirable settlement. He was made a Magistrate of the county and in due time a Member of the Provincial Parliament, and of the Legislative Council, which offices he filled till within a few years of his death.
In June, 1794, His Royal Highness, the Duke of Kent, the father of Queen Victoria, who was then Governor of Nova Scotia, stopped at Alwington Manor.
Although retired from active employ, he still remained in the service on half pay, and in 1804 he was advanced to the rank of Lieutenant Colonel. In 1805 he went to England, where he was received with much distinction, and was presented to the King by the commander-in-chief.
The war of 1812 aroused all the warlike instincts of the old partisan; he snuffed the battle afar off, and at once offered to raise a regiment for home service. He soon had 600 men ready for service, which enabled the Government to send the 104th regiment to Canada, then hardly pressed by invasion. At the peace of 1815 he was promoted to the rank of Major-General, and the regiment disbanded and General Coffin returned to half pay once more.
He for many years alternated in his residence between England and New Brunswick. He was the oldest General in the British Army when he died in 1838, aged 82, at the house of his son, Admiral T. Coffin, in King's County, New Brunswick.