 While in the ORC the gunners constructed 'Fort Antrim', which the Inspector of Fortifications described as 'the finest bit of fortification in South Africa'.At the end of September 1900 a detachment of 25 Antrims joined a similar number of Donegals, all under the command of Capt F.H.Crawford, Adjutant of the Donegals, and proceeded to Orange River Station.