On 2 December 1878, the 5th Company Royal Engineers were sent to the Colony of Natal in response to a request from Lord Chelmsford, commander of the British forces in southern Africa, for an additional unit of engineers to assist with preparations for the invasion of the Zulu Kingdom. After their arrival on 5 January, Chard was dispatched with a small group of sappers to repair and maintain the ponts at one of the few crossings of the Buffalo River which ran along the border of Natal and the Zulu Kingdom. A short distance downstream was Rorke's Drift, an isolated mission station used as a staging post for the British invasion force. It consisted of two thatched bungalows about apart—the western building was used as a hospital, and the eastern building had been converted into a storehouse. Garrisoned at the Drift were Chelmsford's quartermaster general, Major Henry Spalding, a company of the 2nd Battalion 24th Regiment of Foot commanded by Lieutenant Gonville Bromhead, and a large company of the 3rd Natal Native Contingent (NNC).