From March 16th to April 1st, small three days' operations took place from Vaalbank (50 miles W. of Klerksdorp), the men carrying rations on their saddles. Many men had to be sent on to Klerksdorp for remounts, owing to considerable losses in horses from exhaustion and horse-sickness. On the evening of April 4th the mounted troops moved from Middlebult at 7 p.m., rationed for three days, in very heavy rain. The night was pitch dark. At daybreak they attacked and captured a Boer convoy and large herds of cattle and sheep, after a long gallop. On April 9th the mounted troops of the combined columns started from Middlebult to join General Ian Hamilton's big drive and enveloping movement against General Delarey's commandos. After two days' march they arrived at Rooival, passing the scene of Col. Cookson's engagement, which had occurred five days previously, when Delarey surrounded the column, killing all Cookson's horses. Col. von Donop's troops finally took up their position in the driving line on the extreme right, and entrenched for the night. On the following morning, two hours before daybreak, word was brought by the scouts that the combined commandos of Delarey, Kemp, Liebenberg, and Potgeiter, 2,000 strong, with four field guns and two pom-poms (those captured from Col. von Donop's convoy six weeks previously) were halted 6 miles away on the right. Col. von Donop's column, being on the extreme right, was the first to move, the 21st M. I. being ordered to furnish the screen and supports of the advanced guard. At about 6 a.m. the screen came over a rise, and was at once face to face with Delarey's commandos, who were partially concealed in large mealie patches less than 4,000 yards away. Although apparently surprised, the enemy quickly formed into two or three long lines, and riding almost knee to knee, charged through the screen, shouting, and firing from the saddle. The 21st M. I. dismounted, and those horses which were not shot were galloped to the rear, the men lying in the grass and firing at the Boers as they galloped through. Many of the latter and of their horses were shot as they passed von Donop's main body, which by this time had had sufficient warning, and received the charge with a very heavy fire. At the same time Gen. Rawlinson, whose column had come up, met and repulsed an attempted turning movement. The Boers were now effectively stopped, their casualties being very large. Col. von Donop's Scottish Horse were then ordered to charge the enemy, who made a big wheel to the left towards some hills covered with scrub and small trees. The British guns then opening fire caused the whole force of Boers to break and scatter in all directions, though their guns still replied in a desultory way. The British pursued throughout the day, the Boers with their guns and wagons scattering in parties all over the country. By 4 p.m. all their guns and many prisoners had been captured. The 21st M. I.