Short film about the old gun emplacements in Gibraltar and their modern counterparts.

Narrator tells story of Gibraltar having to defend its frontiers with guns; film of the old guns are followed by a reconstruction of the scene in 1762 when Sergeant Ince and his artificer company dug tunnels and placed guns high in the cliffs. Cut to the present; there are now new hillside gun emplacements and Ince's historic guns are being restored by artillerymen in their spare time. Shots of 105mm shells being loaded intercut with pictures of the old guns and reprise of Ince's 1762 emplacement.