voor de Koninklijke Nederlandsche Armee by was published in 1815 and shows about nine basic rudiments. Several manuals are known from the late 1800s and early 1900s, such as Voorschrift voor den seargent of korporaaltamboer of 1893, Tamboers- and Hoornblazersschool of 1896, and Tamboers- and Hoornblazersschool from 1901. The system was simplified and many embellishments removed in the 1930s. The system was again refined following WWII in 1945 and 1946. Now, only the Dutch Marines continue the official military tradition actively, along with a few civilian groups. There are currently only about 14 Dutch rudiments. Russian Russian drumming was originally brought in from abroad specifically to emulate the drumming of other nations. Dutch drumming was used verbatim in the 17th century. This gave way to a more distinct Russian style in the 18th century under Peter I. Imperial Russian military units stopped using drummers around 1909 but the USSR reintroduced drumming to the military in the 1920s. Russia actually has no names or specific sticking for rudimental patterns but a selection of rolls and ruffs of various lengths are present in military music. Youth Pioneer groups use simplified military signals, though the rudiments taught in these groups use American terms. British British rudimental manuals with decipherable rudiments date back as far as 1634 with the publication of Thomas Fisher's Warlike Directions or the Soldiers Practice which shows at least 4 ruff-based rudiments. A more thorough manual appeared in 1760, Spencer's The Drummer's Instructor. British military drumming had already been exported to the American Colonies by the time of the American Revolution in the 1770s. The anonymously authored Young Drummers Assistant was published around 1780 and was an influential book on both sides of the Atlantic. The British system was further refined for the 19th century by Samuel Potter in 1817 with his book The Art of Beating the Drum. In the 18th century, drummers uniforms were reverse color from the rest of their military unit, but after the War of 1812, and coincidentally during Samuel Potter's service, their uniforms were switched to the standard color scheme so as not to stand out in battle. Samuel's son, Henry Potter, a noted instrument maker, would later publish an updated drum manual called Authorised Sergeant Drummers' Manual. In 1887, the War Office published Drum and Flute Duty for the Infantry Branch of the Army which is one of only a few pre-20th century