Tin soldiers were produced in Germany as early as the 1730s, by molding the metal between two pieces of slate. Toy soldiers became widespread during the 18th century, inspired by the military exploits of Frederick the Great. Miniature soldiers were also used in the 17th, 18th, and 19th centuries by military strategists to plan battle tactics by using the figures to show the locations of real soldiers. In 1893, the British toy company William Britain revolutionized the production of toy soldiers by devising the method of hollow casting, making soldiers that were cheaper and lighter than their German counterparts.