results of the mine under it might be better discerned. The artificers broke ground against the side of the hill, 152 feet from the redoubt, and about 20 feet below the summit of the hill. The first gallery was driven 112 feet in length, about 3 feet wide, and 3½ feet high, from whence commenced a turning 22 inches wide and 3 feet high, which stretched under the redoubt. A second turning of 6 feet was made for the chamber, into which was put a wooden box of gunpowder lined with pitched canvas. The quantity of powder used was 72 lbs., and was exploded by means of a wooden trough containing a canvas pipe filled with powder. When fired, the whole redoubt was lifted up about 40 feet, and disappeared in fragments, dust, and smoke, leaving a large chasm where it stood, nearly 40 feet wide and 20 feet deep. It was a magnificent sight, and called forth the spontaneous acclamations of the throng that witnessed it, and the praises of the Duke of Richmond.[86] These were the _first field services_ in which any of the military artificers had been employed. They returned to their respective stations about the 8th August.[87] ----- Footnote 86: For full information concerning these experimental operations and manœuvres, see the ‘Public Advertiser’ for July 9th, August 7th, and August 10th, 1792. Footnote 87: To show how interested and considerate the Duke of Richmond was, in even trivial matters connected with the corps, it may be mentioned that on the 28th September, 1792, he ordered that six married private labourers, who had been at Bagshot Camp under his command, should each be paid half-a-guinea as a donation for the inconvenience and expense they were subjected to in being absent from their families. ----- This year the black felt round hat superseded the cocked hat. The drummers' livery lace was a mixture of black, red, and yellow worsted—the Ordnance device was not woven in it as formerly. It was sewn on the coats in the same style as the privates' lace. Worsted wings of the three colours intermixed were now worn by the drummers for the first time. The quality of the cloth in all ranks was somewhat deteriorated this year. Plate V. To suit the seasons the working dress was considerably altered. In summer a plain raven duck jacket was substituted for the long frock of 1787. The duck waistcoat for summer was abolished. In winter a blue jacket with black cuffs and collar was worn, precisely similar in cut and make to the duck jacket. With this jacket a flannel waistcoat was worn, and serge trowsers or pantaloons of the same form or style as the original pantaloons. To the “Queen’s Bounty,” consisting of a pair of serge breeches and an under serge waistcoat, was added a second serge waistcoat. The shirts were now worn quite plain in front; the hair continued to be queued; and the sergeants and corporals to be undistinguished in rank in the working dress. Plate VI.