The Lithuanian Navy (Lietuvos Karinės jūrų pajėgos) is the naval arm of the Lithuanian Armed Forces. Though formally established on 1 August 1935 its roots stretch back as far as naval engagements on the Baltic Sea in the Medieval period. Lithuanian naval units saw some service with Soviet naval forces during World War II, and the navy has been re-established in its own right and continues to expand since Lithuania's independence in 1990. Although the origin of the Lithuanian Navy dates back to the period between World War I and World War II, the history of the involvement in naval battles existed earlier. The Baltic tribe of Aistians that settled down in the Baltic Sea shore built ships and used them for trade as well as for military purposes. Furthermore, according to annals, in the 13th century other Baltic tribes, the Coronians and Samogitians, tried to destroy the castle of Riga coming by ships. It is also known about the victory of Lithuanians in the ship battle in Nemunas River at the time when Duke Vytenis ruled the Duchy of Lithuania. The most known and important naval victory was achieved by great hetman Jan Karol Chodkiewicz on 24 March 1609 near Salismünde (now Salacgrīva in Latvia) where he defeated a Swedish fleet burning two enemy ships and losing none and hence breaking the blockade of Riga city. But generally the loss of territories near the Baltic Sea had a negative impact on Lithuania's maritime development. The Commonwealth Navy was small and played a relatively minor role in the history of the Commonwealth. Despite having access to the Baltic Sea, neither Poland nor Lithuania had any significant navy throughout their histories. At the turn of the seventeenth century, Poland became ruled by the House of Vasa, and was involved in a series of wars with Sweden (see also dominium maris baltici). Vasa kings attempted to create a proper fleet, but their attempts met with repeated failures, due to lack of funds in the royal treasury (Polish nobility saw little need for the fleet and refused to raise taxes for its construction, and Gdańsk continued its opposition to the idea of a royal fleet).