Question: Rigid frame airships were used by Germany to fly bombing raid over Great Britian in what war?
Sentence (from "List of British airships"): Meanwhile, the British Army's School of Ballooning, later the Air Battalion Royal Engineers, acquired a small fleet of semi-rigid and non-rigid airships for observation purposes; they were taken over by the Royal Navy on the creation of the Royal Naval Air Service in 1914.
Relevant evidence: No