Further naval operations from Port Arthur resulted in two break-out attempts by the Russians. The first was on 23 June 1904, and the second on 10 August, the latter of which resulted in the Battle of the Yellow Sea, which was tactically inconclusive. Afterwards, the Russian fleet did not make any more attempts to break out from their port, while the Japanese fleet dominated the waters for the duration of the war. But mines laid by Russian minelayers were a continuing problem for the IJN and resulted in more losses. On 18 September 1904, the 2,150-ton gunboat struck a Russian mine west of Port Arthur and sank. The same fate befell the 2,440-ton cruiser on 30 November in the same minefield, and on 13 December, the 4,160-ton cruiser sank in another Russian minefield a few miles south of Port Arthur while giving naval gunfire support to the Japanese armies now besieging the port.