The siege of Herat (Persian: فتح هرات) (late March 1856-26 October 1856) was the invasion of the surrounding realm of Herat and the successful siege of its citadel by the Qajar army led by Hesam o-Saltaneh, Soltan Morad Mirza. The 1856 siege was part of the concerted Qajar effort to compensate the recent territorial losses in the Russo-Persian Wars of 1804–1813 and 1826–1828 by reconquering western Afghanistan, which had historically been a part of Persia's domain. The conflict was also a part of the broader Great Game between the British Empire and the Russian Empire.