On February 16 Lord Roberts moved his Head Quarters to Jacobsdaal. It was his intention to advance on Kimberley and to make that town the base of his operations in the direction of Bloemfontein, when suddenly his plans were disarranged by an unexpected event. Cronje, who for two months had held stubbornly to Magersfontein, was reported to be trekking to the east. French's relief of Kimberley, the presence of an infantry division at Klip Drift, and the occupation of Jacobsdaal, were facts which even his obstinacy could not disregard. Like a wild creature startled in the night by a veld fire and suddenly dazzled by the glare, he rushed blindly towards the flames which were soon to consume him. Almost any direction but that which he took, the line of the Modder River, would have given him a better chance of escape. French's maimed cavalry could not have stopped him if he had retreated on either side of Kimberley, and even a withdrawal westward down the right bank of the Riet would have probably saved him. Methuen at Modder River took twelve hours to discover that Magersfontein had been abandoned at midnight on February 15. On the morning of the 16th Kelly-Kenny sent out from Klip Drift a force under C. Knox to cover the advance of the rest of the VIth Division on Kimberley. Soon a long column of dust was observed in the distance beyond the ridge on the right, and a closer examination showed that it was caused by Cronje's wagons. The discovery came not altogether as a surprise, for Boers had been noticed crossing the front on the previous day, and as what was now seen proved to be the rear of a column, the trek must have been some hours in progress. Kelly-Kenny at once abandoned his march on Kimberley and faced eastwards. It was found that the enemy had taken up a rearguard position on the southern end of the ridge. The northern end was soon seized by mounted infantry, but an attempt in interpose between the river and the Boer position failed. The ridge was cleared at 9 a.m. by a frontal attack, but not before Cronje's convoy had retired without molestation to Klip Kraal, where a second rearguard position was taken up on either side of Klip Kraal Drift. On the assumption that Cronje was endeavouring to effect a retreat on Bloemfontein, it was necessary to confine him to the right bank of the Modder. He was already in possession of Klip Kraal Drift, and although he could hardly hope to pass his wagons across it in sight of an active enemy, it was not his only chance. Within ten miles of his laager were Brandvallei, Paardeberg, and Vendutie Drifts, each of which would give him access to the southern bank.