The Second Anglo-Afghan War was fought between the United Kingdom and Afghanistan from 1878 to 1880, when the nation was ruled by Sher Ali Khan of the Barakzai dynasty, the son of former Emir Dost Mohammad Khan. This was the second time British India invaded Afghanistan. The war ended in the Treaty of Gandamak after attaining all the British geopolitical objectives. Most of the British and Indian soldiers withdrew from Afghanistan. The Afghans were permitted to maintain internal sovereignty but they had to cede control of their nation's foreign relations to the British.
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Original Source: National Archives reference WO69