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The Siege of Vellore was an intermittent series of sieges and blockades conducted during the Second Anglo-Mysore War by forces of the Kingdom of Mysore against a British East India Company garrison holding the fortress at Vellore, located in the present-day Indian state of Tamil Nadu.

First besieged in 1780, Mysore's ruler Hyder Ali eventually reduced the siege to a blockade due the need for troops elsewhere. The blockade was ineffectively maintained until 1782 before being abandoned. The British successfully resupplied the garrison of Colonel Ross Lang four times.