The great length of this line enabled the surveyors to take very distant bearings with perfect accuracy. At the same time, Mr. Drummond, of the Royal Engineers, discovered the celebrated light named after him, by means of which, exhibited from the summit of a high mountain in the County Tipperary, its accurate bearing was taken from the base line—a distance of 150 English miles. By this means, also, a bearing in Scotland was obtained for the first time, thus tying in the surveys of Scotland and Ireland. The survey of Ireland was constructed on a very large scale, and included the acreage of arable, pasture, mountain, and bog lands, besides being a geological survey. And it is a curious fact, that when the periodical work of twenty or thirty parties were sent in, the chief engineer sitting in his office could detect the slightest error in any one of them, and send it back for correction, so that the whole should tie in with the most perfect accuracy. Leaving Londonderry, the regiment was next quartered at Enniskillen, situated on Loch Erne. The scenery in this neighbourhood is beautiful, and the hospitality of its numerous gentry could not be surpassed. Sir Henry Brooke, Bart., had a splendid mansion, including forty bedrooms. There were fox-hounds and harriers, and the hunting parties generally included three or four ladies. There was excellent shooting, and any number of guns with gamekeepers; good salmon and trout fishing, with plenty of tackle; and billiard tables. There was a succession of company during the season, each party being invited for three or four days, with horses and carriages for their use. The tenantry had been living on the estate for three or four generations, many of them wealthy, and to crown all the host and hostess were most amiable and accomplished persons. A general order to the troops serving in Ireland was issued at this time, directing an officer and two sergeants from each regiment to proceed to Dublin to be instructed in the broadsword exercise, which they were afterwards to teach to the officers and men of their respective regiments. I volunteered to proceed on this duty, and became an honorary member of the mess of the Rifle Brigade. A very eminent swordsman, Mr. Michael Angelo, was the instructor at the Riding School of the Royal Barracks. The instruction lasted for four months, and was a very fine exercise, bringing every muscle into action. But the regimental drills afterwards were very troublesome, and occupied much time.