During the First World War, Britain came under attack from the air, putting civilians in the firing line for the very first time.
At the start of the war, Britain was ill-prepared to deal with the threat from enemy airships and aircraft. Traditionally its home defence focussed on defending the coastline rather than its airspace and with most of the Royal Flying Corps (RFC) operating overseas, few aircraft remained to defend Britain.
The First World War was a war of innovation. Advances in weaponry and military technology provoked tactical changes as each side tried to gain an advantage over the other. Here are 10 important 'firsts' that happened during the First World War, the effects of which can still be felt today.