For as soon as he had disposed of the prisoners of Mostert's Hoek, he cast his eye round the horizon and descried two other isolated garrisons, at Smithfield and Wepener. Against the former he sent one of his lieutenants, who, however, found the little town evacuated, while he himself made for Wepener, and longing to teach a lesson to Brabant's loyal colonials, sat down before it on April 9 with ten guns and 6,000 men. In the course of the northward advance from the Orange it had been occupied by a detachment from Brabant's force, which was increased by subsequent reinforcements to a strength of nearly 1,900 men under Dalgety, of whom little more than 100 were regular troops, with seven guns. The town itself was not held, but a circular position outside it with a perimeter of seven miles was taken up on the right bank of the Caledon. De Wet maintained the siege for sixteen days. The failure of an attempt by night on April 10 to storm a post on the southern section of the perimeter deterred the Boers, as at Ladysmith after the abortive attack on Caesar's Camp two months before, from further offensive action; but the position was vigorously bombarded from time to time, and an almost unceasing hail of Mauser bullets fell upon it. De Wet did his best to add Wepener to the scalps of Sannah's Post and Mostert's Hoek; but when two columns detailed for the relief by Lord Roberts under the command of Brabant and Hart, who had come round from Natal with his brigade, reached Wepener from Aliwal North on April 25, they found that the siege had been raised, and that De Wet had trekked away to the north.