The Imperial German Army attempts its first airship raid against the United Kingdom with the Zeppelin Z XII. Unable to find targets through cloud cover, Z XII drops no bombs, but over Calais, France, on the way home makes the first use of a manned observation car lowered by winch below the Zeppelin to allow observation while the airship remains safely above cloud cover. The German Navy later also experiments with such cars and later makes them standard equipment aboard German naval airships.