On March 1, they passed the Adour, and after a long march entered Mont-de-Marsan, which the enemy evacuated just before they reached it. Here they were quartered in good houses, and had comfortable beds: a change very refreshing to them after their long marches, often in very bad weather, and after their exposed bivouacks. On the next day the 2nd Battalion marched to Bertam, and the 3rd Battalion to St. Maurice; the march was through the pine forests and by the sandy roads of the Landes; and being made in a snow storm was very painful to the soldiers. On the next day the 3rd Battalion moved on to St. Sever, where Lord Wellington had fixed his head-quarters. Here they continued till the 8th, furnishing the guards and duties of head-quarters. On the 4th the 2nd Battalion had marched to Bascom, where they remained till the 9th, when both Battalions re-united near Aire, whither the 3rd Battalion had marched, crossing the Adour on the 8th and moving to Grenade; and next day to Barcelonne opposite Aire on the right bank of that river. On the 10th both Battalions marched at daylight to some poor cottages near Arblade, and on the 11th entered Tarsac, where they halted for the night. The 1st Battalion now rejoined the Light Division, and the Regiment was re-united. On the 14th, as Soult assembled a considerable force and threatened General Hill’s corps, the Regiment was moved back through Tarsac and formed on the high road near a wood, where they remained the whole day expecting to be engaged; but the enemy retiring after making a demonstration only, they marched back to Tarsac and re-occupied their quarters there. The enemy had left a rear-guard of cavalry, and as they remained during the next two days, it was determined on the 16th to attack them. The 15th Hussars were with the Riflemen at Tarsac; and accordingly on that morning this regiment moved out to attack the French cavalry. This consisted of the 13th French Hussars, and they sent one squadron in advance, the rest of the regiment being formed in support. The English cavalry adopted the same formation, and a squadron under Captain Hancox, supported by the 2nd Battalion, advanced to meet their opponents. The French were rapidly charged and upset; many of them sabred; and about twenty-five made prisoners, among whom was the French Captain. He was badly wounded, and died of his wounds in his father’s house, to which he was taken. For he was a native of the place, which it was said he had not visited for many years. The rest of the French cavalry rapidly retired and escaped. On the 18th the Regiment advanced by the road by which the French had retreated, and crossing the Adour by a bridge at Arros (or La Rose) proceeded to St. Germain; whence, after a short halt, to Plaisance, where they remained for the night, three companies of the 1st Battalion being pushed across the river.