Garvock consented to follow the Commissioner's advice, and arranged to move on the following day.
The force was divided into three columns.

The first and second--consisting of about 4,800 men, and commanded respectively by Colonel W.Turner, C.B.,[16] and Lieutenant-Colonel Wilde, C.B .-- were to form the attacking party, while the third, about 3,000 strong, under the command of Lieutenant-Colonel Vaughan,[17] was to be left for the protection of the camp.
At daybreak, on the 15th, the troops for the advance, unencumbered by tents or baggage, and each man carrying two days' rations, assembled at the base of the 'Crag piquet.' Turner, an excellent officer, who during the short time he had been at Umbeyla had inspired great confidence by his soldierly qualities, had on the previous afternoon reconnoitred to the right of the camp, and had discovered that about 4,000 men were holding the village of Lalu, from which it was necessary to dislodge them before Umbeyla could be attacked.

On being told to advance, therefore, Turner moved off in the direction of Lalu, and, driving the enemy's piquets before him, occupied the heights overlooking the valley, out of which rose, immediately in front about 200 yards off, a conical hill which hid Lalu from view.

This hill, which was crowded with Hindustani fanatics and their Pathan allies, was a most formidable position; the sides were precipitous, and the summit was strengthened by _sangars_.[18] No further move could be made until the enemy were dislodged, so Turner lined the heights all round with his Infantry, and opened fire with his Mountain guns.
Meanwhile, Wilde's column had cleared off the enemy from the front of the camp, and formed up on Turner's left.

On the advance being sounded, Turner's Infantry rushed down the slopes, and in ten minutes could be seen driving the enemy from the heights on his right; at the same time the 101st Fusiliers, the leading regiment of Wilde's column, made straight for the top of the conical hill, and, under cover of the fire from the Mountain guns of both columns, and supported by the Guides, 4th Gurkhas, and 23rd Pioneers, they climbed the almost perpendicular sides.