Full title reads: "Bisley. 'See The Conquering Heroine Comes' Again! Miss Muriel Foster ... adds to Women's recent triumphs over men, by winning the King's Prize ... for the first time in history against 99 of Empire's Best Shots."
Shots of rifle shooting competition. Shooters are lying down while observers sit on chairs. The rifle shooter on the end is obviously a woman. Pan across to show small targets some distance away on the rifle range.
The winning shooter, Miss Muriel Foster, is carried on a chair by other competitors in a crowd. This is a traditional for the winner of the King's Prize at Bisley.
N.B. This may be related to the item that actually belongs in 30/15