The Great Game was a rivalry between the 19th-century British and Russian Empires over influence in Central Asia, primarily in Afghanistan, Persia, and later Tibet. The two colonial empires used military interventions and diplomatic negotiations to acquire and redefine territories in Central and South Asia. Russia conquered Turkestan, and Britain expanded and set the borders of British colonial India. By the early 20th century, a line of independent states, tribes, and monarchies from the shore of the Caspian Sea to the Eastern Himalayas were made into protectorates and territories of the two empires. Though the Great Game was marked by distrust, diplomatic intrigue, and regional wars, it never erupted into a full-scale war directly between Russian and British colonial forces. However, the two nations battled in the Crimean War from 1853 to 1856, which affected the Great Game. The Russian and British Empires also cooperated numerous times during the Great Game, including many treaties and the Afghan Boundary Commission. Britain feared Russia's southward expansion would threaten India, while Russia feared the expansion of British interests into Central Asia. As a result, Britain made it a high priority to protect all approaches to India, while Russia continued its military conquest of Central Asia. Aware of the importance of India to the British, Russian efforts in the region often had the aim of extorting concessions from them in Europe, but after 1801, they had no serious intention of directly attacking India. Russian war plans for India that were proposed but never materialised included the Duhamel and Khrulev plans of the Crimean War (1853–1856). Russia and Britain's 19th-century rivalry in Asia began with the planned Indian March of Paul and Russian invasions of Iran in 1804–1813 and 1826–1828, shuffling Persia into a competition between colonial powers. These weren’t the first of Russian designs on India, the first being the 1717 expedition to Khiva by Alexander Bekovich, a officer of the renowned life guards regiment.
Sylvain Calinon, Emmanuel Pignat, Hakan Girgin, Noémie Laure Gwendoline Jaquier