[5] At the request of John Devoy, the leader of the Clan na Gael, and Tom Clarke, the architect of the Easter Rising, McNulty returned to Ireland in 1915, while recovering from typhoid fever[1][4][6] He served as a company captain, recruiter, organiser, trainer and the Commandant of the Doe Battalion, County Donegal.
[7] In February 1916, in an effort to improve morale and attract new recruits to the Volunteers, James, along with IRB member Daniel Kelly, organised a rally at Doe Castle at Sheephaven Bay, near Creeslough.
[8][9][10] McNulty was also a recruiter and member of the local club of the Sinn Féin political party during this time known as the Irish revolutionary period.
Early in 1919, while conducting inspections with the Irish Volunteers, McNulty was shot in the shoulder by Andrew Wilkinson, J.P. (Justice of the Peace) and seriously wounded.
James was initially taken to nearby Carrigart and examined by Dr. McClusky, who ordered for McNulty's immediate transfer to Dublin to have the bullet extracted at the Mater Hospital.
A train carrying British troops was derailed and 15 men were injured,[13] James was consequently arrested on 12 February 1921 by the Royal Irish Constabulary (a.k.a.
[4] In October 1924, after his release from Derry Gaol, James, his wife, Anne (née Nelis), whom he married in February 1917, soon emigrated to the United States with their children, partly to avoid any retaliation from the British.