by Generals Koos de la Rey and Christiaan Beyers combined to deal a defeat to a British brigade under the command of Major General R. A. P. Clements during the Second Boer War .
During the Anglo-Boer War , a British garrison of 2000 men under Colonel E. H. Dalgety was besieged by the Boer commandosmilitary.military_commandthe command of General Christiaan de Wet at Jammersdrift on the Caledon River .