28 February 1900
British reinforcements arrive to relieve troops stationed at Ladysmith after a siege of 4 months, during the Second Anglo-Boer War (1899-1902). Ladysmith was not the only town to be under Boer siege. Towns like Mafikeng, and Kimberley were besieged for equally long periods. 
References

Brittish Battles, The Siege of Ladysmith, from Brittish Battles, [online], Available at www.britishbattles.com [Accessed: 31 January 2014]