<P> The horse had been extinct in the Western Hemisphere for approximately 10,000 years prior to the arrival of Spanish Conquistadors in the early 16th century . Consequently, the Indigenous peoples of the Americas had no warfare technologies that could overcome the considerable advantage provided by European horses and gunpowder weapons . In particular this resulted in the conquest of the Aztec and Inca empires . The speed and increased impact of cavalry contributed to a number of early victories by European fighters in open terrain, though their success was limited in more mountainous regions . The Incas' well - maintained roads in the Andes enabled quick mounted raids, such as those undertaken by the Spanish while resisting the siege of Cuzco in 1536--7 . </P> <P> Indigenous populations of South America soon learned to use horses . In Chile, the Mapuche began using cavalry in the Arauco War in 1586 . They drove the Spanish out of Araucanía at the beginning of the 17th century . Later, the Mapuche conducted mounted raids known as Malónes, first on Spanish, then on Chilean and Argentine settlements until well into the 19th century . In North America, Native Americans also quickly learned to use horses . In particular, the people of the Great Plains, such as the Comanche and the Cheyenne, became renowned horseback fighters . By the 19th century, they presented a formidable force against the United States Army . </P> <P> During the American Revolutionary War (1775--1783), the Continental Army made relatively little use of cavalry, primarily relying on infantry and a few dragoon regiments . The United States Congress eventually authorized regiments specifically designated as cavalry in 1855 . The newly formed American cavalry adopted tactics based on experiences fighting over vast distances during the Mexican War (1846--1848) and against indigenous peoples on the western frontier, abandoning some European traditions . </P> <P> During the American Civil War (1861--1865), cavalry held the most important and respected role it would ever hold in the American military . Field artillery in the American Civil War was also highly mobile . Both horses and mules pulled the guns, though only horses were used on the battlefield . At the beginning of the war, most of the experienced cavalry officers were from the South and thus joined the Confederacy, leading to the Confederate Army's initial battlefield superiority . The tide turned at the 1863 Battle of Brandy Station, part of the Gettysburg campaign, where the Union cavalry, in the largest cavalry battle ever fought on the American continent, ended the dominance of the South . By 1865, Union cavalry were decisive in achieving victory . So important were horses to individual soldiers that the surrender terms at Appomattox allowed every Confederate cavalryman to take his horse home with him . This was because, unlike their Union counterparts, Confederate cavalrymen provided their own horses for service instead of drawing them from the government . </P>

What new inventions assisted a soldier in manoeuvring on horseback