Easter Saturday

Reinforcements were sent to Dublin from England, and disembarked at Kingstown on the morning of 26 April. Heavy fighting occurred at the rebel-held positions around the Grand Canal as these troops advanced towards Dublin. The Sherwood Foresters were repeatedly caught in a cross-fire trying to cross the canal at Mount Street. Seventeen Volunteers were able to severely disrupt the British advance, killing or wounding 240 men. The rebel position at the South Dublin Union (site of the present day St. James's Hospital), further west along the canal, also inflicted heavy losses on British troops trying to advance towards Dublin Castle. Cathal Brugha, a rebel officer, distinguished himself in this action and was badly wounded.

The headquarters garrison, after days of shelling, were forced to abandon their headquarters when fire caused by the shells spread to the GPO. They tunnelled through the walls of the neighbouring buildings in order to evacuate the Post Office without coming under fire and took up a new position in 16 Moore Street. On Saturday 29 April, from this new headquarters, after realizing that they could not break out of this position without further loss of civilian life, Pearse issued an order for all companies to surrender. Pearce surrendered unconditionally to Brigadier-General Lowe. The surrender document read:

"In order to prevent the further slaughter of Dublin citizens, and in the hope of saving the lives of our followers now surrounded and hopelessly outnumbered, the members of the Provisional Government present at headquarters have agreed to an unconditional surrender, and the commandants of the various districts in the City and County will order their commands to lay down arms."