Planes were a very new invention, they were rare and fragile. But when World War One started they became weapons. Pilots could spy on enemy targets and the first bombs were dropped from the air.
"Not just because of the truly awful effects but also because they are a banned weapon, prohibited from use for nearly 100 years ... civil war. A similar pattern of reported chemical weapons ...
Archaeologists in Denmark have discovered a cache of more than 100 ... weapons were purposefully buried during a house demolition, researchers think that they were sacrificed after success in war.