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Afghanistan and Central Asia

In 1835, Lord Auckland was appointed Governor-General, and replaced Bentinck who had pursued a non-intervention policy. The India Board instructed Auckland:

to watch more closely than has hitherto been attempted the progress of events in Afghanistan, and to counteract the progress of Russian influence...The mode of dealing with this very important question, whether by dispatching a confidential agent to Dost Mohammed of Kabul merely to watch the progress of events, or to enter into relations with this Chief, either of a political or merely in the first instance of a commercial character, we confide in your discretion as well as the adoption of any other measures that may appear to you desirable to counteract Russian influence in that quarter, should you be satisfied...that the time has arrived at which it would be right for you to interfere decidedly in the affairs of Afghanistan. Such an interference would doubtless be requisite, either to prevent the extension of Persian dominion in that quarter or to raise a timely barrier against the impending encroachments of Russian influence.

In that year, Lieutenant John Wood of the Indian Navy commanded the first steamboat to paddle up the Indus River and surveyed the river as he went. In 1838, he led an expedition that found one of the River Oxus' sources in central Asia. He published his travels in 1872. In 1837, the Russian envoy Captain Jan Vitkevitch visited Kabul, and the British believed that it was to facilitate some form of diplomatic or military presence in Afghanistan. While in Kabul, he dined with the British envoy, Captain Alexander Burnes, who reported negatively on Russia's intentions. Russia feared British inroads on their commerce in Central Asia, as well as the influence that a Muslim power with British support might have on the other khanates. In 1837, Russian troops occupied the island of Ashuradeh in the Gorgan Bay of the southern Caspian Sea. However, from 1837 to 1857 the Russian Empire lent their support to the Shah.

In 1838, Colonel Charles Stoddart of the East India Company arrived in the Emirate of Bukhara to arrange an alliance with Nasrullah Khan. Nasrullah Khan had Stoddart imprisoned in a vermin-infested dungeon because he had not bowed nor brought gifts. In 1841, Captain Arthur Conolly arrived to try to secure Stoddart's release. He was also imprisoned and on 17 June 1842 both men were beheaded. On hearing of the execution of the two British officers, Emperor Nicholas I of Russia would no longer receive Bukhara's gifts or emissaries, and its ambassador was turned back at Orenburg with a message that the Emperor would no longer have anything to do with the Emir of Bukhara. After its two representatives were executed in Bukhara, Britain actively discouraged officers from traveling in Turkestan.

During 1838, there were rumors in London of a coming Russian move towards Khiva. Additionally, Persia intended to annex Herat to make up for territory it had lost in the Russo-Persian War (1826–1828), however the allegiance of Herat to Afghanistan was crucial to the British strategy. The Siege of Herat began in November 1837, when the new Shah of Persia, Mohammed Mirza, arrived before Herat. His intention was to take Herat then move on to Kandahar. With him was the Russian Envoy Count Simonich, seconded Russian officers and a regiment of Russian deserters under the Polish general Berowski. Eldred Pottinger, an officer of the Bengal Artillery, who had earlier entered Herat in disguise, stiffened the defences and despite the presence of Russian advisers the siege lasted eight months. Britain threatened to take military action and Persia withdrew in September.

In October 1838, Auckland issued the Simla Manifesto, a piece of propaganda designed to blacken the reputation of Dost Mohammad Khan (Emir of Afghanistan) and which claimed that Dost Mohammad:

openly threatened...to call in every foreign aid that he could command...we could never hope that the tranquility of our neighborhood could be secured...the Governor-General confidently hopes that the Shah will speedily be replaced on his throne...the independence and integrity of Afghanistan restored, the British army will be withdrawn.