From their great numbers and strong bulwarks they concluded they were impregnable. It is agreed they had that day on Vinegar-hill 30,000! We reconnoitred for some time, and distinctly observed them to draw up in _solid lines_. The order of Battle was to commence, by the command of Gen. Lake, at 9 o'clock. His Army took one side of the Hill to bombard it, the Light Brigade, under Col. Campbell took another--other Commanders were fixed in like manner. Our Brigade, consisting of the Armagh, Cavan, Durham, Antrim, and part of the Londonderry, Dunbarton, Tyrone and Suffolk--in all about 3000 brave Troops had to march four miles; it being appointed that we should flank them in another quarter. I shall give you a view of their situation--Vinegar-hill is very steep, rising in the form of a cone: at the but of it are two other hills, with quicksets and other ditches across them--these were lined with their musketry men:--a river ran at the bottom of both, and adjacent was a small wood. At the bottom of Vinegar-hill was the once beautiful, but now ruined town of Enniscorthy--on the top of the great hill was the but of an old windmill, on which they had placed their _green flag_ of defiance--in a word, the position of the Rebels was one of the strongest I ever saw. The Rebels did not wait the time appointed, but commenced cannonading at seven o'clock. They could not tell what to make of the bombs, and said "they spit fire at us"--indeed they answered they desired end, by the numbers they destroyed upon their bursting. The Light Brigade, assisted by the Cavalry gained one of the lesser hills, planted their Cannon and played briskly on them: in a short time we possessed ourselves of both--the Rebels made to the top of Vinegar-hill with all possible speed--the Soldiers pursued hard after them, and beat them off it. In a little time the _green flag_ became a prey to the Royal Band, who triumphed in its fall--it was an arduous attempt, but we succeeded in the end. The Rebel commanders deserted their men when they found the day proved unfavourable to their interests and fled towards Wexford, leaving the deluded wretches to be cut in pieces. The engagement lasted two hours and an half--the Soldiers merited the cloth they wore, and gloried in the name of WILLIAM. Our Brigade remained all night in the demesne of Harvey Hay, one of the Rebel Chiefs: next day we returned to Houlet again, where we encamped for two days. The scouting parties killed more after the different engagements than what fell in Battle--many of their Commanders, were taken and hanged. We have suffered much from lying on the roads and ditches rolled in our blankets, I have almost lost my hearing, but am content when the good old cause triumphs.