The siege of Silistria, or siege of Silistra, was a key engagement in the Crimean War, fought from 11 May to 23 June 1854 between the Russian Empire and the Ottoman Empire in present-day Bulgaria. The Russian army, numbering up to 90,000 men with 266 guns, attempted to capture the Danubian fortress of Silistria as part of a broader strategy to outflank Ottoman defences and pre-empt an expected Allied landing at Varna. The garrison, 12,000 to 18,000 Ottoman troops and Egyptian auxiliaries, was bolstered by British military advisers and successfully withstood a six-week siege.
The operation was shaped by diplomatic and regional tensions. Russia hoped for a general Balkan uprising and misjudged the likelihood of Austrian or Serbian neutrality. Austria, concerned that a Russian advance might provoke unrest among its own Serb population, mobilised 280,000 troops along the Danube and warned Russia against crossing the river. At the same time, Anglo-French troops began arriving in Varna, and a joint Austrian–Ottoman convention granted Austria the right to occupy the Danubian Principalities of Wallachia and Moldavia.
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