Slaters' Directory, 1880, records the existence of militia barracks at Rosemary Lane and notes the presence of the Royal Anglesey Engineers. It is not clear whether the Engineers were based at these barracks.

The local newspaper, Y Clorianydd, reports a dinner provided by the Mayor and Mayoress for the members of the militia on their departure for the Boer War. The Mayoress presented the men with pipes and tobacco. The troop of 25 men of the Royal Anglesey Engineers left the barracks at 5 pm, led by the Bangor Volunteers' Band and eventually sailed from Southampton.