At the outbreak of the Second Boer War in October 1899, Major General Hunter (although actually Chief of Staff to General Sir Redvers Buller's 1st Army Corps) was on the staff of Sir George White's Natal Field Force during the Battle of Ladysmith in Natal and the subsequent 118-day siege. On 8 December he successfully led a small raid against one of the Boers' Creusot "Long Tom" guns and a howitzer which they disabled with cotton charges.