Owen McDonnell (Ned Daly) and Lochlainn O'Mearain (Piaras Béaslaí) during a break in filming in Birr, Co. Offaly.

Owen McDonnell (Ned Daly) and Lochlainn O'Mearain (Piaras Béaslaí) shooting a scene in the beautiful vintage Ford.

Lochlainn O'Mearain (Piaras Béaslaí) during filming for the opening scene of A Terrible Beauty in Birr, Co. Offaly.

Director Keith Farrell and DOP Colm Whelan line up a shot in Birr, Co. Offaly.

Director Keith Farrell discusses a scene with Cillian O'Donnachadha (Seamus Grace) in Birr, Co. Offaly.

Director Keith Farrell and Cillian O'Donnachadha (Seamus Grace) during filming on the streets of Birr, Co. Offaly.

Cast and Crew take shelter from the rain in Birr, Co. Offaly.

Production Manager Rebecca O'Malley and Irish Volunteers Seamus Hughes, Malachy McKenna and Cillian O'Donnachadha relax and learn their lines during a break in filming.

Director Keith Farrell and Cillian O'Donnachadha (Seamus Grace) discuss the battle scene in '25 Northumberland Road'.

Stunt Coordinators Paul Valentine and John Sheridan discuss tactics during filming at Cathal Brugha Barracks, Dublin.

Machine Gun Nest at Cathal Brugha Barracks, Dublin.

Director Keith Farrell discusses a scene with 'British Troops' at Cathal Brugha Barracks.

Noel Whelan points to where he wants his men to shoot.

Laurence Thermes takes aim from the machine gun nest.

The last of the 'British Soldiers' manning the machine gun is gunned down.