[4] Doyle was a member of 'F' Company, 1st Battalion, Dublin Brigade, Irish Republican Army and was tried on 24 February 1921 by court-martial, charged with high treason and levying war against the King for his part in an attempted ambush at Drumcondra on 21 January that year.

His wife gave birth to twins shortly before his death, one of whom died on 12 March.

[6] Doyle's brother Seán was killed in action at the Custom House six weeks after the execution.

[2] He is one of a group of men hanged in Mountjoy Prison in the period 1920-1921 commonly referred to as The Forgotten Ten.

In 2001 he and the other nine, including Kevin Barry and Frank Flood, were exhumed from their graves in the prison and given a full State Funeral.