Various guns were used, until a true dueling pistol was officially standardized in 1777, as "a 9 or 10 inch barreled, smooth bore flintlock of 1 inch bore, carrying a ball of 48 to the pound." ...

But when World ... war. The British Mark I tank was used in September 1916. It held ten men and reached speeds of almost four miles per hour. Battleships were the largest warships and had very big ...

In four years, American industrial production, already the world's largest ... period and 55,000 antiaircraft guns. In an attempt to coordinate government war agencies Roosevelt created the ...