15 May 1900
Dundee and Glencoe were retaken by General Sir Redvers Buller troops as the South African War II 1899-1902 (Anglo-Boer War II 1899-1902) intensified. The area west of Glencoe was under the command of General Schalk Burger, who would later be replaced by General Joachim Fourie. The two areas were and are still separated from each other by less than 10km in KwaZulu Natal. The war ended on 31 May, 1902 following the signing of the Peace Treaty of Vereeniging by all the parties involved in the war.
References

Gillings, K. ‘After the Siege: The British advance and Boer retreat through Natal, March to June 1900’, from The South African Military Journal, Vol 11 No 3/4 - October 1999.|

South African History Online, ‘South African War 1899-1902  Second Anglo-Boer War’, [online], available at www.sahistory.org.za (Accessed: 15 April 2013)|

Boddy-Evans, A. ‘This Day in African History: 15 May’, from About African History, [online], available at https://africanhistory.about.com