Simon Jones is a former curator at the Royal Engineers and King’s Liverpool Regiment Museums. He has studied World War I for over 20 years and has written a number of excellent articles on gas and mine warfare. This is his first book for Osprey. Simon lives in Liverpool, UK.Richard Hook was born in 1938 and trained at Reigate College of Art. After national service with 1st Bn, Queen's Royal Regiment, he became art editor of the much-praised magazine Finding Out during the 1960s. He has worked as a freelance illustrator ever since, earning an international reputation and has illustrated more than 50 Osprey titles. Richard lives in Sussex.

• IntroductionPrecursorsGerman first use of chlorine, Ypres, April 1915British retaliation, Loos, September 1915Development of gasmasks, 1915–16Attacks, 1916–18Gas shells, 1916The Livens projector, 1916–18Gas grenades, 1915–18Gas shells, 1917–18 Gas mask developments, 1917–18 Conclusion