Colonel Knox now set about clearing the country to the east, between the Pivaan and Pongola Rivers, to prevent the Boers breaking back south of the Pongola, while General French, continuing his march with the columns of General Dartnell and Colonel Pulteney, moved on Vryheid, where he established his headquarters on the 25th of March. Here General Hildyard had accumulated a large reserve of supplies for the whole force, thus materially facilitating the progress of further operations. The movement to clear the angle between the Swazi and Zulu frontiers began on the 27th of March and terminated on the 15th of April. General Dartnell, with ten days' supplies, moved east from Vryheid, with Pulteney east-south-east on his right rear, and Alderson (who started two days later from some four miles south of the Pivaan Bridge) on his left rear. Colonel Pulteney speedily came in contact with Grobelaar's commando, drove it north, where it came in collision with General Dartnell, who, after some skirmishing, killed and wounded some twenty Boers. The General was now forced to push on with mounted troops and a few guns only, for the country was impassable for wheeled transport, and therefore it had to be left behind in charge of the infantry. He formed a depôt some thirty miles east-south-east of Vryheid, while Colonel Alderson formed his about twenty-five miles north-east of Vryheid. More fighting took place on the 31st between the Boers and General Dartnell some twelve miles north of his depôt, in which engagement four Boers were slain, ten taken prisoners, and waggons, cattle, and sheep were captured. Their pom-pom--previously destroyed to prevent it being of service to us--was thrown over a precipice by the flying foe. The troops moving on east through the low-lying bush veldt came on more Boers on the 2nd, engaged them, cleared the country, returned to Toovernsaarsrust on the 4th, and moved on the 5th and 6th to Vryheid, where General Dartnell for five days took a well-earned rest. Colonel Alderson had meanwhile taken a prodigious share in the work. He had sped hot foot after a party of Boers that had broken northwards, caught them on the 3rd near the junction of the Pivaan and Pongola Rivers, and succeeded in effecting the capture of their cattle, waggons, and mules. On the following day he rested at Nooitgadacht, a place six miles east of Vryheid. He then (on the 6th) passed Vryheid, and proceeded, in three columns, to sweep the country south of that place, while General Dartnell acted as a stop on the line Vryheid-Toovernsaarsrust. By the 13th Colonel Alderson had fulfilled his mission, and "accomplished all that was feasible." He then returned to Vryheid, and the difficult and fatiguing operations were practically concluded.