Next day a battle of the usual type was fought. The mounted troops worked upon the flanks of the enemy, who was posted on a line of kopjes on each side of the railway, while the infantry attacked frontally with success and drove back the burghers, who retired in good order towards Brandfort unmolested by the cavalry, which was as before too much exhausted for effective pursuit. Thus, at a cost of less than 200 casualties, Lord Roberts made good the first stage on the road to the north. Soon after his entry into Bloemfontein Lord Roberts sent out a small mounted column under Amphlett to Sannah's Post, where the water which supplied the capital was drawn from the Modder River. This had been cut off by the enemy, and the Army was dependent upon the disused and tainted wells within the city. The Boer commandos, which under the command of Olivier had retreated from the Cape Colony to Ladybrand and Clocolan, now began to threaten Broadwood, who, when French was sent to Glen, succeeded to the command of the mounted column. Broadwood was compelled to retire from Thabanchu on March 30. Early on the following morning he bivouacked at the Waterworks, whither his convoy under Pilcher had already preceded him; and simultaneously the IXth Division under Colvile and a brigade of Mounted Infantry under Martyr were ordered out from Bloemfontein to help him in. Meanwhile De Wet at Brandfort was watching his opportunity of working at the task assigned to him under the Krijgsraad scheme, of attacking the British lines of communication. His anticipation that the burghers would return with renewed vigour from the furlough which they had granted to themselves proved to be accurate. While Smuts was standing up to Tucker and French at Karee Siding, 1,600 men with five field guns under C. De Wet, whose second in command was his brother Piet, were circling to the Waterworks. The initial direction of the march was N.E., in order to conceal the real objective of the raid even from his own men. His intention was to seize Amphlett at the Waterworks, and there lie in wait for Broadwood's convoy. Before reaching his destination he handed over two-thirds of his force to his brother, who early in the morning took up a position on the right bank of the Modder east and north of the Waterworks, while he himself went to the Wagon Drift on the Korn Spruit, where the bed is deep enough to afford perfect concealment to a large body of men in ambush. He occupied it at 4 a.m. on March 31.