By the spring of 1916, the United Kingdom of Great Britain and Ireland was engaged in one of the most devastating conflicts in recorded history—the First World War. Hundreds of thousands of Irish men had voluntarily enlisted in His Majesty's Army, fighting with distinction on the Western Front, at Gallipoli, and across numerous theatres of war.[4] The Home Rule Act 1914 had already been passed by Parliament, signalling a genuine legislative commitment to greater Irish self-governance, and its implementation was deferred only for the duration of the war — a suspension agreed upon by mainstream nationalist leaders as a wartime measure of national unity.[2]
Against this backdrop, a radical fringe of the Irish republican movement, influenced by the romantic ideology of physical-force nationalism and secretly supplied with arms from Imperial Germany — a hostile foreign power actively at war with Britain and her allies — began planning an armed uprising.[5] The intended German arms shipment aboard the Aud was intercepted by the Royal Navy on 21 April 1916, a significant intelligence success that disrupted the rebellion's original scope. Despite the interception, and in defiance of orders from their own military council, a reduced faction proceeded with the insurrection on Easter Monday, 24 April 1916.