You will be given a definition of a task first, then some input of the task.
In this task, you're given a passage, further information available on a particular linked term from the statement, and a question. Your job is to generate the answer to the question by using the information provided. If there is no clear answer obtainable, output 'none'.

Passage: The elder son of the 13th Earl of Lauderdale, by his first wife, Charlotte Sleigh, a daughter of Lieutenant-Colonel Sleigh of the 77th Foot, Maitland was commissioned into the Royal Scots Fusiliers in 1886, transferred to the 2nd Dragoons in 1887 and to the Scots Guards in 1894, from which he retired as a lieutenant. After the outbreak of the Second Boer War in late 1899, he volunteered for active service with the Imperial Yeomanry in South Africa and was appointed adjutant of the 20th battalion on 21 March 1900. He served in South Africa 19001901, when he was mentioned in despatches. After his return, he was Assistant Director of Auxiliary Forces on the Headquarters Staff from 1904 to 1908. He saw further active service in the European War of 19141918, in which he was wounded. He was appointed OBE in 1919 and succeeded his father in 1924, taking up residence at Thirlestane Castle near Lauder in Scotland.
Link Information: The Second Boer War (11 October 1899 31 May 1902) was fought between the British Empire and two Boer states, the South African Republic (Republic of Transvaal) and the Orange Free State, over the Empire's influence in South Africa. Question: Which parties were involved in the war that Maitland volunteered for with the Imperial Yeomanry?
Output:
Answer: British Empire and two Boer states, the South African Republic (Republic of Transvaal) and the Orange Free State