[3] He was one of the Guard of Honour at the funeral of Jeremiah O'Donovan Rossa in August 1915, and was present when Patrick Pearse gave his famous speech at the graveside.

[9] Early in the morning of Friday 28 April, he volunteered as a stretcher-bearer to carry the wounded James Connolly out of the GPO, which was by then on fire.

Under heavy machine-gun fire, he and two others (Sean Price and Paddy Ryan) carried Connolly to an Irish Volunteer position in a mineral water factory on Henry Place.

[10] Prior to the Rising, there is a report of Gogan working in a bomb factory at a house called 'Cluny'[11] in Clontarf which was used as an Irish Volunteers' munitions base.

[13] Taking the anti Treaty side in the Civil War, he took part in the occupation and defence of buildings during the Battle of Dublin.