Final answer:
The sniper's side in the Irish Civil War would depend on their view regarding the Anglo-Irish Treaty; opposition to the treaty implied fighting for a republic, while support meant backing the Irish Free State. The war decided Ireland's status post-independence.
Step-by-step explanation:
The question refers to the Irish Civil War, which was fought to decide whether Ireland should become a free state or a republic. During the conflict after the Anglo-Irish Treaty, there was a division in Sinn Féin, with some members desiring an independent republic and opposing the treaty, which led to the creation of the Irish Free State, a dominion with self-governing authority though still within the British Empire. Ultimately, those who supported the treaty and the creation of the Irish Free State won the civil war.
As this information is directly related to the war in Ireland, the sniper's allegiance would depend on their view regarding the treaty: if they opposed the treaty and wanted an entirely independent Irish republic, they would have been against the Free State. If they supported the treaty's implementation and the establishment of the Irish Free State with dominion status, they would have been on the Free State's side.