Easter Rising - a black soldier?

There have been a number of threads on the Great War Forum re black soldiers in the British Army during WW1, e.g the West Indies Regiment. Up until now, I've not seen any mention of any black soldiers in Ireland.

Researching Cadet MacKay, Boland's Mill, de Valera and Captain Hitzen, the witness statement of Andrew McDonnell makes mention of a black soldier. No more information is given e.g regiment (possibly the Lincolnshire Regiment?).