Having raised the Siege of Kimberley, at the Battle of Paardeberg on 27 February 1900 Roberts forced the Boer General Piet Cronjé to surrender with some 4,000 men. After another victory at Poplar Grove, Roberts captured the Free State capital Bloemfontein on 13 March. His further advance was delayed by his disastrous attempt to reorganise his army's logistic system on the Indian Army model in the midst of the war. The resulting chaos and shortage of supplies contributed to a severe typhoid epidemic that inflicted far heavier losses on the British forces than they suffered in combat.