Initially, the studio bowed to pressure from the Roosevelt Administration, the Hays Office, and isolationist lawmakers to desist from similar projects. Jack Warner announced that the studio would release no more "propaganda pictures" and promptly ordered the shelving of several projects with an anti-Nazi theme. In time, however, Warner Bros. produced more films with anti-Nazi messages, including "Underground" and "All Through the Night". In 1940, the studio produced short films that dramatically documented the devastation wrought by the German bombing raids on London. Meanwhile, the studio celebrated the exploits of the Royal Canadian Air Force, with films such as "Captains of the Clouds". In 1941, Warner also produced the influential war film "Sergeant York".