He served on the Army Executive of the IRA in this period .
He opposed the Anglo - Irish Treaty in 1922 and sided with the Anti-Treaty IRA during the Civil War with the Irish Free State forces in 1922 -- 23 .
He served on the Army Executive of the Anti-Treaty IRA in this period .
He opposed the Anglo - Irish Treaty in 1922 and sided with the Anti-Treaty IRA during the Civil War with the Irish Free State forces in 1922 -- 23 .