The actual takeover of Petrograd was organised by Trotsky. On 24 October, units of the Red Guards took control of the city. Key buildings, power stations, railway and tram stations, important bridges were in Bolshevik hands. A large warship that was sympathetic to the Bolsheviks, the "Aurora", steamed up the river Neva and trained its guns on the Winter Palace, where the Provisional Government was located.