The regiment remained in garrison at Jellalabad until the 6th August, when it moved forwards to Futtehabad for change of air, having suffered severely from the extreme heat of the weather. So great was the heat, that six men fell dead in the ranks of apoplexy the first march. On the 1st of September, the THIRTEENTH received orders to join the force under Major-General Pollock at Gundamuck, to which place the regiment marched on the following morning, and joined on the 3rd. It remained there until the 7th, when it moved towards Cabool, forming part of the first division of the advance, which was placed under the command of Major-General Sir Robert Sale. On the 8th, upon nearing _Jugdulluck_, the Affghans were observed in position, and the THIRTEENTH under Captain Wilkinson were directed to carry the left centre of the enemy, which was done in gallant style. The enemy were dispersed in every direction, a large body of them retiring to the summit of a high mountain. On this rugged and almost inaccessible height they planted their standards, but as the achievements of the day would have been incomplete were they suffered to remain, it was decided to dislodge them. The lofty heights were assaulted in two columns, the THIRTEENTH being led by Captain Wilkinson, and the Ghilzies fled from their last and least assailable stronghold. Major-General Sir Robert Sale was again wounded. The other casualties of the regiment were one private killed and two serjeants and twelve privates wounded. The THIRTEENTH bivouacked in the valley of Jugdulluck, which was strewn with the blackened remains of their unfortunate comrades of the Cabool force. Near this place Brevet Major Kershaw and Lieutenant Hobhouse of the THIRTEENTH were killed in January 1842, while retiring with the force from Cabool. The enemy showed no opposition to the advance of the army until nearing the valley of _Tezeen_, when some skirmishing took place, and the troops halted in the valley a day to allow the rear division of the advance to close up. The road from Tezeen to Khoord Cabool was through a succession of lofty hills, called the Huft Kotul, or Eight Hills. Dispositions for the attack of the _Huft Kotul Pass_ having been made on the 12th of September, the force moved off on the following morning, and three companies of the THIRTEENTH formed part of the advance guard under Sir Robert Sale. To them was allotted the duty of clearing the right of the Pass, which was effectively done. A company under Lieutenant W. A. Sinclair, which formed part of the force placed under Major Skinner of the thirty-first regiment, and which was detached on the right of the pass, also distinguished itself.