line because a lack of water and pack animals made the reliable railway an obvious choice. Also, Buller had given him orders to evacuate the civilians in Kimberley and the railway was the only means of mass transport available. But his strategy had the disadvantage of making the direction of his approach obvious. Nevertheless, his army drove the Boers out of their defensive positions along the railway line at Belmont, Graspan, and the Modder River, at the cost of a thousand casualties. The British were forced to stop their advance within of Kimberley at the Modder River crossing. The Boers had demolished the railway bridge when they retreated, and it had to be repaired before the army could advance any further. Methuen also needed several days for supplies and reinforcements to be brought forward, and for his extended supply line to be secured from sabotage. The Boers were badly shaken by their three successive defeats and also required time to recover. The delay gave them time to bring up reinforcements, to reorganise, and to improve their next line of defence at Magersfontein. Prelude Boer defences After the Battle of the Modder River, the Boers initially retreated to Jacobsdal, where a commando from Mafeking linked up with them. The following day, Cronje moved his forces north to Scholtz Nek and Spytfontein, where they began to fortify themselves in the hills that made up the last defensible position along the railway line to Kimberley. Although closer to the British camp than the Boer camp, Jacobsdal was left poorly defended, and continued to function as the Boers' supply base until 3 December. The Free State government decided to reinforce Cronje's position after the Battle of Belmont. Between eight hundred and a thousand men of the Heilbron, Kroonstad and Bethlehem commandos arrived at Spytfontein from Natal, accompanied by elements of the Ficksburg and Ladybrand commandos from the Basuto border. Reinforcements were also brought up from the Bloemhof and Wolmaranstad commandos who were besieging Kimberley. The remainder of Cronje's force arrived from the siege of Mafeking. Their force now numbered 8,500 fighters, excluding camp followers and the African labourers who performed the actual work of digging the Boer entrenchments. Koos de la Rey had been absent from the army immediately after the Battle of the Modder River, having gone to Jacobsdal to bury his son Adriaan, who had been killed by a British shell during