The occupation of the drifts was soon made known to Cronje, but the news revealed little to his dull and uninstructed nature, permeated with the idea that a British force and a railway were indissoluble entities. Though his communications eastward were now seriously threatened, it did not occur to him that there might be an alternative to fighting him out of Magersfontein, namely manoeuvring him out of it; and he persuaded himself that French's movement was a trap to entice him away pending an attack on Magersfontein from the south, and he was probably unaware that the relief of Kimberley was an urgent matter. He moved his own camp from Brown's Drift to a less exposed position at Bosjespan, and while retaining his hold on Magersfontein with his main body, sent out two commandos to watch French, and these accidentally occupied a line through which the cavalry must pass on its way to Kimberley. The arrival of the VIth Division on the morning of February 15 set French free to resume his march on Kimberley. The two commandos had on the previous day joined hands with Lubbe, who, after he was pushed out of French's way, crossed the Modder at Klip Kraal Drift and worked round to a position north of Klip Drift. The relieving force was now obstructed in the line of its advance by ridges on its right and left fronts and by the nek connecting them, all occupied by the enemy; while on its left flank was Cronje's new camp at Bosjespan, of the existence of which it was unaware. The situation seemed awkward, as the only way out of it was the shallow valley leading up to the nek, and exposed to a converging fire from the ridges on which two guns were posted. But French was not long in doubt, and like a bridge player who in order to win the game is sometimes compelled to assume the position of certain cards, with rare intuition correctly assumed that the nek was weakly held. Like a ship going down the ways to the water, the Division was launched to the front; cleaving the opposing waves and gaining momentum as it advanced, then righting itself, rose to the slope of the nek and carried it with resistless energy. After a short midday halt at Abon's Dam, French raised the siege of Kimberley before sunset; the besiegers under Ferreira did not wait to be attacked, but withdrew towards Boshof. The relief of Kimberley was perhaps the most brilliant feat of arms in the campaign. It was well-conceived and, considered by itself alone, well carried out, but the merit of it has been obscured by the fact that it cost less than half a hundred human casualties. When, on the morning of February 15, the VIth Division took over the outposts, and the Cavalry Division fell in on the banks of the Modder, there was the terrain of a Balaklava charge before it.