Invented by Count Ferdinand von Zeppelin in 1900. London was first targeted with airships in May 1915 and initially found defence very difficult. Searchlights and incendiary ammunition helped to defeat the Zeppelins and the last raid was in August 1918. has a great post about the Zeppelin raids over London, with a map! And has a good post on airships over London in war and peace.
But to get a really good idea of how they were used (the bombs, the water ballast, the observer basket) you have to see the 1930 film Hell's Angels. Forget the plot and the acting, just watch the stunning aerial scenes. Howard Hughes produced it so money was no object.
2018: have a post about the first Zeppelin raid on London, 31 May 1915, with maps showing the damage sites.
2025: reported on the grave of a hero who was the first to shoot down a Zeppelin.
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