The O'Rourke Brothers from Grand Canal Harbour, Athy, gave more family members to the IRA, than any other local family members in County Kildare. Michael O'Rourke was Captain, A Company, 5th`Battalion Carlow Brigade. Brothers Jim, Tom, Fran, Joe and Dinny were also in the IRA company.
During the Civil War all were Anti Treaty. Michael and Jim were interned in The Curragh and Newbridge Internment Camps from 1922 until 1923.