Siege of Dorostolon
…on the Danube. Once John I usurped the throne, the Byzantines launched a counteroffensive. After they defeated the united Rus'-Bulgarian forces in the Battle of Arcadiopolis and recaptured Pereyaslavets, Svyatoslav was forced to flee to the northern fortress of Dorostolon (Drustur/Dorostorum). Emperor John proceeded to lay…