Chemical weapons

From ‘War by Poison’, The Spectator, 8 May 1915: By the consent of all men who are not savages, the use of poison is ruled out in war, and has been prohibited by custom for centuries. And war by poison is being practised not only in Europe; in German South-West Africa the Union troops, as we are informed by a Colonial Office Paper, have come across many wells poisoned with arsenic… ‘Poisoned wells’! The very phrase calls up visions of warfare with the wildest and most fanatical tribesmen in the world, but not with the inhabitants of the most highly organised country in Europe.