A sequel to Bombs and Bombing, this is taken from his column in PM, and expanded into a popularization of ballistics for the layman. Ley writes informatively on guns of yesterday and today, and proves that the age of artillery is still with us and that war power depends on firepower. He traces briefly the history of firearms, from the Black Friar Bethold's invention in the 14th century to the present; he describes types of arms and explosives, ammunition, trench artillery, grenades and mortars, guns and howitzers, the Big Bertha and its ilk, and lastly rockets. A clear picture of the theory and practice of shooting. For the market interested in the hows of war.