The Dublin Fusiliers actively took part in the efforts to lift the Siege of Ladysmith, which lasted from 30 October 1899 to 28 February 1900. On 15 December the 2nd Dublins took part in the Battle of Colenso. The Dublins were part of the 5th Brigade (known as the Irish Brigade) who crossed the wrong part of the Tugela River and suffered heavy casualties in the process. The battle was a defeat for the British forces and became part of a notorious period for the British in the war, known as "Black Week". The defeat, however, did not discourage further attempts being made. The Dublins did not participate in any more attempts until January 1900 when they took part in the Tugela campaign, collectively known as the Battle of the Tugela Heights. February saw the Dublins take part in heavy fighting before, on 27 February, they supported the Royal Irish Fusiliers in their final charge on Pieters Hill, suffering heavy casualties though taking the position. This victory led to the siege of Ladysmith being lifted the following day by cavalry, with the main force of infantry arriving on 3 March. On 10 March 1900 Queen Victoria decreed that a sprig of shamrock be adorned on the headdress of Irish units on Saint Patrick's Day to commemorate their actions in South Africa. This tradition remains in existence with Irish units of the British Army.