Did you know that London suffered aerial bombing during WWI by aircraft taking off from Berlin, even though planes of the day only had a range of 200 miles, a third of the distance from Berlin to London?
German Zeppelins dropped bombs on London. The Zeppelins were held aloft by bags of hydrogen gas made of cattle intestines. The large lighter-than-air craft cruised at 80 miles per hour. However, they lacked heated and pressurized cabins, subjecting crews to extreme cold and altitude sickness.