I've answered a question about this before. Nothing really happened, in truth. Little news could get out of Dublin to the front, and when it did the rising was simply one more lost cause in a long list of lost causes in Irish history. That's how it was described to German interrogators by Irish-Australian POWs, and it was even more ambivalent to the men of the 16th division. Many of them had been moderates, and supported Home Rule, enlisting at the call of John Redmond, not the types to support radical republicans. In fact, Tom Kettle was quite bitter about the whole affair: "history will remember them as heroes, and I'll just be a bloody British officer."