It was done up to the technological limit of the time, which was mostly zeppelins. https://www.iwm.org.uk/history/the-air-raids-that-shook-britain-in-the-first

It was done up to the technological limit of the time, which was mostly zeppelins. https://www.iwm.org.uk/history/the-air-raids-that-shook-britain-in-the-first-world-war https://www.iwm.org.uk/history/the-air-raids-that-shook-brit...