Energized by Sinn Féin's victory in the General Election of 1918 and the party's establishment of the independent Irish Republic, Henry participates in the Soloheadbeg Ambush, the first engagement of the Irish War of Independence, as a lookout.
On that same day, an ambush was carried out by Irish Volunteers Seán Treacy, Dan Breen, Seán Hogan, Séamus Robinson, Tadhg Crowe, Paddy McCormack, Paddy O'Dwyer, Michael Ryan and Seán O'Meara (the latter two being cycle scouts).
Crossbarry Ambush | Ambush Valley | Ambush Bug | Uzbin Valley ambush | Soloheadbeg Ambush | Galashki ambush | Clonbanin Ambush |