The surrender of the rebels who were involved in the Easter Rising in April 1916 resulted in many consequences. These can be categorised into immediate results, short-term results and long term results.
The immediate results caused by the surrender of the Rising came into effect almost instantly. The first consequence is the actual failure of the Rising and the death toll that it brought. Loss of life wasn't the only damage sustained, over two million pounds of collateral damage was also endured. A further immediate result was the introduction of Martial law under General Maxwell. The leaders who organised the Rising were arrested. The initial reaction of the people was against the rebels because of the damage they had caused to Dublin City, and this, in conjunction with the courts-martial led to the executions of the rebels between 3rd-12th May 1916. A final immediate consequence was the internment of 1840 suspected members of Sinn Fein.
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There were various short-term results as well. The effects of the executions led to a change in public opinion regarding the rebels; anger turned to sympathy. There was also the demise of the Irish Parliamentary Party (IPP) because it had supported the British War effort in 1014, it had condemned the Rising itself, and had failed to achieve Home Rule, settling for postponement. John Dillon urged the Government not to make martyrs of the rebels. The demise of the IPP coincided with the anger and disgust of the people at the Government because of the public execution of the rebels. The public now supported Sinn Fein because they felt that the IPP had let them down. Sinn Fein transformed at this time - they were believed to be behind the Rising (even though they weren't). In 1917, they won the local elections. They established local clubs and had 1200 by October 1917. At the Sinn Fein Ard-Fheis in the same month, de Valera was elected as President of Sinn Fein.
During Easter week 1916, de Valera was stationed at Boland's Mills with the third battalion of Volunteers. ... In the aftermath of the Rising de Valera's death sentence was commuted to life imprisonment. ... Relatively unknown before the Rising, de Valera, the senior surviving Commandant, subsequently showed himself to be a powerful political figure. ...