He had expected that the promised supports would secure his left flank by seizing Horseshoe Hill, and in default he was compelled to detach a portion of his own scanty force against it. At sunset the cutting edge of the advancing wedge was touching the enemy, but was unable to break into him, and Briton and Boer were face to face on Wynne's Hill and on Horseshoe Hill. Reinforcements were brought up and defences were constructed during the night, while the Boers continually fired upon the confused units labouring in the darkness. The enemy had an entrenched position on Hart's Hill which enfiladed Wynne's Hill, and which Warren had not been able to take, as Buller hoped, with the 11th Brigade. Next morning the 5th Brigade under Hart, which was in reserve near the river loop, was sent against Hart's Hill. He advanced, wherever possible, under cover of the steep left bank of the river along a trail so narrow that the men were compelled often to move in single file; and at one place, where the Langewacht Spruit enters the Tugela, it was necessary to make a detour and cross the spruit by the railway bridge, and to quit the dead ground and emerge on to a defile under heavy fire. The advance of the Brigade was retarded by the stringing out of the battalions, and from time to time Hart's Hill was shelled without seriously harming the enemy, who as usual was not posted on the apparent crest, but some distance in rear of it. Two battalions of the 4th Brigade, which had been lent to Hart, were so far behind that as only two or three hours of daylight remained, he decided to attack without them. For impetuous gallantry the advance of the Irish regiments was not surpassed by any other exploit in the War. Working up on difficult ground to the sound of the Regimental calls, and then almost brought to a standstill by the barbed wire fences of the railway, which became a trap of death, they rushed the slope, pushing the enemy's outposts before them, and won the crest: and then in the failing light which compelled the supporting artillery to discontinue the bombardment and relieve the enemy from the pressure of shrapnel, they saw the Boer positions still above them. The crest was false. It was a cruel disappointment to brave men who had struggled so well, but they did not flinch. A charge was made across the plateau, but it soon was withered by fire and few of the men reached the Boer trenches. Two more battalions of the 4th Brigade arrived at dawn, but the reinforcement came too late. The troops were reorganized, as far as possible, on the slope leading down from the crest, but were eventually compelled to retire across the railway to the lower ground by flanking fire, which Hart succeeded in silencing, and was able to reoccupy the dead ground below the false crest with fresh troops.