Sergeant O'Brien directing a group of men in handling a cannon during a war games campaign. The cannon is designed to keep marauding enemy aircraft so high that they can not strafe ground troops or lay bombs accurately. The gun crew is inspecting and handling parts of the cannon together. Everyone is dressed in military uniform which includes a long sleeved shirt tucked into trousers and a wide-brimmed hat. Around them are a variety of trees, fallen branches and bushes.
This project was funded by Institute of Museum and Library Services/Texas State Library and Archives Commission.