Rehearsals for the Portsmouth Navy Week.
Full title reads: "PORTSMOUTH NAVY WEEK - Rehearsal in full swing - Routine on board H.M.S. Iron Duke."
Sailors are seen climbing into a small boat, boat is lowered into water and they start rowing. A big gun is fired from a battleship.
Several shots of the Royal Marines, marching, presenting arms and firing into the air. Sailors doing various PT (Physical Training) exercises with chairs. Boy cadets in uniforms dancing.