On this day in 1916, on Easter Monday in Dublin, the Irish Republican Brotherhood, a secret organization of Irish nationalists led by Patrick Pearse, launches the so-called Easter Rebellion, an armed uprising against British rule. Assisted by militant Irish socialists under James Connolly, Pearse and his fellow Republicans rioted and attacked British provincial government headquarters across Dublin and seized the Irish capital's General Post Office. Following these successes, they proclaimed the independence of Ireland, which had been under the repressive thumb of the United Kingdom for centuries, and by the next morning were in control of much of the city. Later that day, however, British authorities launched a counteroffensive, and by April 29 the uprising had been crushed. Nevertheless, the Easter Rebellion is considered a significant marker on the road to establishing an independent Irish republic.