Following the outbreak of the Second Boer War in South Africa in October 1899, a number of regiments from areas containing large centres of population formed additional regular battalions. The Royal Munster Fusiliers were announced to be among those regiments set to form 3rd and 4th regular battalions in February 1900, but they do not appear to have done so. The 1st Royal Munster Fusiliers embarked for South Africa in 1899, and would serve there throughout the entire Second Boer War. Initially, the battalion took part in Lord Robert's advance into the Orange Free State. Following this, the battalion was attached to the 20th Brigade and fought at the Battle of Belmont. With the beginning of the war's guerrilla warfare phase, the battalion took part in numerous pacification campaigns against the Boers in Pretoria and Western Transvaal. The 3rd (Militia) Battalion, Royal Munster Fusiliers, formerly the South Cork Light Infantry, was embodied in early December 1899, and 435 officers and men embarked the "SS Sumatra" for South Africa on 23 February 1900. The 2nd Battalion, Royal Munster Fusiliers, arrived in South Africa from India in December 1901 and served during the closing stages of the campaign, garrisoning blockhouses in the northeast of the Orange River Colony.