During the night of 27 August 1916 three Romanian small torpedo boats (the old 10-ton Rândunica and the converted hydraulic service vessels Bujorescu and Catinca, each armed with two torpedoes in wooden carriages) attacked the Austro-Hungarian Danube Flotilla stationed in the Bulgarian port of Ruse, which consisted of five monitors and four armed river boats. The objective was to sink one of the monitors, but the attack failed in its immediate purpose, as only one barge loaded with fuel was sunk (by Rândunica, commanded by Captain Niculescu Rizea) and a quay was damaged by another torpedo. Due to this attack, however, the Austro-Hungarian Danube Flotilla (Commander Karl Lucich) retreated 130 kilometres (81 miles) west along the Danube, stopping at Belene and subsequently taking extensive defensive measures.