Of the features mentioned, the Bridle Drift on the west, the iron road-bridge in the centre, and Hlangwane Hill on the east, are the principal points to remember. On the British side of the river, a plain sloped gradually down to the southern bank from a distance of two or three miles. It was divided north and south by a slight swell in the ground, flat-topped, of height just sufficient to conceal men on one side of it from those on the other. On the eastern edge of this rise, the railroad track ran north to the bridge. On the western side, and between 3000 and 4000 yards from Wylie, was placed the chief naval battery, the two 4.7-inch and four 12-pounders. Between these and the railroad was to advance the central column of attack, the 2nd Brigade under General Hildyard. To the left rear of this, between it and the 5th Brigade—which, as before said, was directed upon the Bridle Drift—was placed the 4th, under Major General Lyttelton, charged with the duty of reinforcing either the 2nd or the 5th, as circumstances might demand during the progress of the fight. The 6th Brigade—Major-General Barton—was to advance on the east of the railroad, in general support of Hildyard. On this part of the field the ground was flat, but intersected by several dongas. Each extreme of the line of infantry formed by the four brigades was covered as usual by a flanking force, chiefly of horse; but while that on the British left had this function only, that on the right, the mounted brigade, with one battery—six guns—was to attempt Hlangwane Hill. If successful, it was to enfilade the Wylie kopjes from that position. The remaining four batteries of field artillery were intended at the proper moment to concentrate their fire upon the Wylie kopjes, preparing the way for the crucial charge of the 2nd Brigade. For this object, two followed Lyttelton's 4th Brigade, and two the 6th; the last, under Colonel Long, being accompanied by six naval 12-pounders.
From these dispositions it appears, as is clearly stated by Buller in his report, that all the differing factors in the attack were to converge for their object, and according to their respective qualities, upon "the kopjes north of the iron bridge"—to use Clery's expression in the orders for battle. The 2nd Brigade marched upon them direct; the 5th approached their right flank by way of the Bridle Drift; the 4th and 6th reinforced, as required, each of the others; the four batteries—two on either side—brought a cross-fire upon the same objects; while the flanking force on the British right was to assist by an enfilading fire from Hlangwane. To combine several separate efforts, so that by mutual support and effect each at the critical moments contributes its due share to the one main exertion, is always difficult. Failure may ensue from lack of the nicest attention on the part of any one subordinate, or from those chances which must always be allowed for in war. The British at Colenso suffered from both causes.
Hart, on the left, having the longest road to reach the kopjes, moved first. The brigade reached the river, but missed the ford. It has been said that the enemy, by building a dam below, had raised the water to seven feet. Be that as it may, a few venturing in with musket and ammunition belts were drowned. Groping for the way, and apparently confused between the tortuous courses of the river itself and a tributary which enters near by, the mass of the troops blundered into a sharp bend curving to the northward, thus coming under a cross fire from the two enclosing banks. Here they became heavily engaged, and Buller, seeing the hopelessness of the position, recalled them. It was necessary, however, to send two of Lyttelton's battalions and two batteries to extricate them. Hart's attack therefore had failed, and his division contributed nothing further except the menace of its presence, which must retain some of the enemy to resist a possible renewal.
A yet more decisive mishap meanwhile had occurred in another part of the field. Reckoning that Hart and Hildyard were to attack in mutual support, the time had come for the latter to advance, and he had done so. The beginning of his movement was to have been covered by the six naval 12-pounders accompanying Long's two field batteries, and a position had been appointed them to that effect; it being intended apparently that the army guns should not come into action till later, when the development of Hildyard's movement would permit them to approach the enemy within their shorter range without losing the necessary support of infantry fire,—directly by the 6th brigade, specifically charged with that duty, and indirectly by the occupation which Hildyard's attack would necessarily give the Boers. Instead, however, of attending closely to the requirements of a movement where a certain exactness of touch was evidently necessary, Long's two field batteries, leaving their infantry escort behind, galloped rapidly forward on the east side of the railroad and came into action 1200 yards from Fort Wylie, and, as Buller judged, only 300[28] yards from the enemy's rifle pits. The slow-moving oxen fortunately were unable to drag the heavier naval guns to the same position to share the fate that quickly befell. A very heavy fire was opened from the Boer rifle pits, and although the gunners stuck manfully to their pieces until the ammunition in the limbers was exhausted, they were compelled then to leave them on the plain, retreating for shelter to a donga. The breech-blocks, even, were not carried away; it is said because they expected to return again to action. The naval detachment, 300 yards further back, were exposed to the same fire, but received only its outer fringe. The native drivers bolted, and many of the oxen were killed or stampeded; but the seamen contrived to drag their guns out of range.
News of this mishap reached Buller as he was returning from witnessing Hart's discomfiture. Hildyard was directed to move two regiments of his advancing brigade to the right to save the pieces; but, though the order was steadily executed, it was found impossible to keep the troops out of cover under the fire of Wylie, which had been momentarily silenced by Long's impetuous attack, but had now opened again. The batteries had failed by preceding, and so losing, infantry support; the infantry in turn failed because the guns were powerless. A sudden and desperate rush with harnessed teams succeeded in withdrawing two of the twelve abandoned pieces, in performing which service the son of Lord Roberts lost his life. But a second attempt found the enemy on guard again, and out of 22 horses that started 13 were killed before half-way to the spot.
The naval 12-pounder accompanying Long having been rendered immobile for the day, and the two batteries sacrificed, Sir Redvers Buller decided that without their support it would be impossible to force the passage. He therefore directed a general withdrawal to the camp. The abandoned batteries were left in the open, where, together with the wounded men and some of the supports sent in by Hildyard, they were taken by the Boers. The British loss in missing and prisoners was 21 officers and 207 men. There were killed 135, and wounded 762. The enemy remained unshaken in his positions.
This mortifying reverse, following sharply upon the heels of Magersfontein and Stormberg, thoroughly aroused the British people, who neither at home nor on the field were prepared for it. The day after the receipt of the news, Saturday, December 16th, a Cabinet meeting was held, and the next evening it was announced that, as the campaign in Natal was likely to require the undivided attention of Sir Redvers Buller, Lord Roberts would be sent to South Africa as Commander-in-Chief, and would be accompanied by Lord Kitchener as Chief of Staff. At the same time the rest of the Army Reserve was called out, and further measures taken which carried the troops employed in South Africa to, and beyond, the large numbers already quoted as despatched by the end of the following March.
Lord Roberts sailed from England December 23rd. On the 26th, at Gibraltar, he picked up Kitchener, who had been brought there by a swift naval cruiser, and on the 10th of January, 1900, he landed at Cape Town.