In May, the British began their advance towards the Transvaal, one of the Boer republics, and early the following month the Dublins took part in the effort against Laing's Nek during the attempt to achieve an entry into the Transvaal. This was successfully achieved and the capital, Pretoria, was captured on 5 June. The war, however, did not end and the Boers began a guerrilla campaign against the British. During this phase of the war, many blockhouses were constructed to help restrict the movement of the Boer guerrillas and men of the Dublin Fusiliers helped to garrison them. This phase of the war also saw the mounted infantry companies, among which were Dublin Fusiliers MI, in their element, hunting the (now small) groups of Boers. The Dublin Fusiliers also took part in the hunt for Christiaan de Wet, a prominent Boer officer.