In 1814, there were 1500 prisoners of American nationality in No. 4. They despaired of freedom, and were rendered restless by the French prisoners evacuating the prison after the abdication of Napoleon, 4 April, 1814, and the end of the European war. Then there were 3500 American prisoners moved into No. 5, and by 31 December in that year the number amounted to 5326, mainly in the buildings 4 and 5.

Those in No. 4 now resolved on making an attempt at escape, and they began to excavate a tunnel that was to run 250 feet and enable those in the ward to escape, not only out of the block, but also beyond the outer wall. American blacksmiths among the prisoners furnished the necessary tools, and correspondence was maintained with American agents outside, and a fleet of friendly fishing boats was hovering about in Tor Bay to receive the prisoners. But they were betrayed by one of their number, who led the Governor to the excavation when it had been carried as far as sixty feet. It was at once choked up with masses of granite and cement, and those who had been engaged on it were put on short commons. This was in the summer of 1814. The attempt completely upset Governor Shortland’s nerves.

On 24 December, 1814, peace between England and America was signed at Ghent, and the news speedily reached England, but did not arrive in the United States, and was not published there till 11 February, 1815. By 1 January, 1815, the American prisoners in Princetown were aware that the time of their incarceration was drawing to an end. Indeed, they might have all been discharged, but that the Government waited for the United States Government to send men-of-war or other vessels to convey the prisoners to America. A misunderstanding prevented their immediate release. The American Government considered it the duty of the British Government to reconvey the prisoners to the United States, and undertook in return to reconvey the British prisoners detained in their prisons to Bermuda or Halifax. Lord Castlereagh objected to this as an unfair and unreasonable distribution of expenses, for Great Britain would be put to the expense, not only of conveying the American prisoners to the States, but also of bringing home from Bermuda and Halifax all the prisoners of her own nationality.

At the end of March, 1815, three months after peace had been concluded, there were 5693 prisoners within the walls of Princetown Gaol. That these were restless and impatient at their detention is not to be wondered at. But their chief irritation was against Mr. Beasley, the agent, whom they considered as dilatory, and who they supposed ought at once to have provided for their repatriation, they being unaware of the contention between the two Governments as to the cost of this repatriation. They were further incensed against him because, according to the testimony of John C. Clement, one of them, made in Philadelphia: “During our confinement, the American agent (Beasley) did not give us, say from 2 April, 1813, to March, 1814, the 6s. 8d. sterling per month, as well as the suit of clothes allowed us annually by our Government, which money and clothes the prisoners have never received; and when I, with two hundred and fifty others, were released from prison, there was likewise a shirt, a pair of shoes, and 6s. 8d. due to us, which we never received. The prisoners had applied to Beasley repeatedly for what was due to them, but received no satisfaction. He never visited the prisons but once during the two years and upwards I was there.” On 4 April the Governor went to Plymouth; and orders had been left that the prisoners were to be given biscuit in place of bread. This they resented, and refused the biscuit. Towards evening they broke out in mutiny and threatened to sack the stores unless they were at once provided with bread, but this was done and they were satisfied.

A messenger was at once dispatched to Plymouth to announce to Shortland that the captives were in rebellion. When he received the news he rushed off to the Citadel and begged for a reinforcement of two hundred men to be added to the five hundred Somersetshire and Derbyshire militiamen already at Princetown. Accordingly these soldiers, under Major Joliffe, were accorded him. He returned with them to Princetown, and found that the rioters had peacefully retired to their beds after the outbreak and promised to give no more trouble.

Governor Shortland was somewhat irritated against the Americans on account of a practical joke they had recently played on him. One evening they had attached a jacket and a pair of breeches to a string, and had let them down over the outer wall. A turnkey saw what he supposed to be a prisoner in the act of making his escape, and communicated with the Governor, who called out some warders, marched to within some yards of the spot, and ordered a volley to be fired at the supposed escaping prisoner. As he did not fall, a little nearer inspection revealed that an April fool had been made of him.

On 6 April, at 6 p.m., Captain Shortland was informed that a hole had been discovered in the wall that separated the yard No. 6 from No. 7. This hole, says Andrews, had been made that same afternoon by some of the Americans out of mere mischief, and without any design of effecting their escape. Indeed, why should they attempt it, when their release was at hand, and they were in daily expectation of receiving their cartels of discharge?

Other prisoners state that the hole was made by some of the boys whose ball, as they were playing, had flown over into the next yard, and they bored through so as to recover their ball. Directly it was discovered a sentinel was placed by it to prevent its being enlarged; but it was then no bigger than that a head could be thrust through; and afterward, through the hole in the wall, the sentinel remonstrated with the prisoners on the other side.

All the prisoners who were subsequently examined protested on oath that the perforation was not made with intent to escape, or to get at the armoury so as to provide themselves with weapons. This, however, was the view taken of it by Shortland, and in a fit of nervous fear he ordered the alarm bells to be pealed and the military to be called out. These latter issued from their barracks with drums beating to arms. This was at ten minutes to six in the evening.

This sudden and unexpected alarm excited the attention and curiosity of the prisoners, and they poured forth from their wards, filled the inner yard and rushed to the outer gates. They suspected that fire had broken out.