Wisłoujście Fortress is located in direct proximity to the Westerplatte peninsula. This was an important area from a strategic point of view, as the movement of ships entering and leaving Gdańsk harbour could be controlled from this place. The first written comments on the existence of a guard post in the place of the present fortress date from the mid-14th century. The first permanent fortifications were built just after Gdańsk broke free from the Teutonic Knights’ reign (1308-1454). In 1482 a brick cylindrical tower was erected used both for defense purposes and as a lighthouse. The tower itself did not provide sufficient defense, and therefore during the Polish-Teutonic Knights war between 1518–21, wooden fortifications were built around the lighthouse. Subsequent defense structures were added over the following decades. In 1562 the wooden fortifications surrounding the tower were replaced with a three-storey brick ring with casemates.
The 16th century and more specifically its end, was a period of rapid development in guns and their ensuing increased destructive power, which necessitated the modernization of the fortifications and the establishment of new defense systems. Gdańsk relatively quickly became aware of the need to undertake these expensive works, which however were necessary for the city’s security. In the 1580s a four-bastion Carré fort was built around the ring in place of the former wooden fortifications, designed according to the rules of the new Italian art of fortification. It was most likely designed by the Flemish fortifications expert, Antoni van Obberghen. The fort’s bastions had casemates and gun stations, which allowed one to fire along the walls. The foreground could be fired upon with guns located in the bastions. The casemates had 1586 and 1587 date inscriptions, indicating the time of completing the construction of individual fortification structures. Fort Carré was surrounded by a moat, through which the way to the inside lead, located in the curtain wall between the bastions.
The entry was protected by a gate and drawbridge. The gate tunnel is built diagonally in relation to the entry axis in order to protect the interior of the fort from potential gunfire. The 1602 date inscription in the entry portal of the fort refers to the date of completing the works on the fort.
The Eastern Entrenchment was erected during 1624-26 to protect the fort against direct attack and was constructed according to the guidelines of the Italian expert, Hieronim Ferrero. It consisted of 5 earth bastions preceded by a moat. The similar Western Entrenchment was located on the other bank of the Vistula river directly opposite the fortress. The fortifications of both entrenchments were constantly developed and implemented in the 18th century.
The fortress fortifications and city defense system were merged into a unified defense system in 1657–58. The Fortress itself, the New Harbour and Westerplatte were additionally strengthened during the Napoleonic wars. Ultimately, the fortress had lost its military significance after WWI through the demilitarization of Gdańsk. Between the two world wars it was used as a marina by many yacht clubs. The facility was destroyed during the war in 1945 and was partially rebuilt in the sixties. Further reconstruction of the facility and its planned adaptation to a yacht marina was discontinued as a result of the construction of industrial plants in the direct vicinity and their negative impact on the structure. Since 1974 Wisłoujście Fortress has been administered by the Gdańsk History Museum.References:
The Walled City of Jajce is a medieval fortified nucleus of Jajce in Bosnia and Herzegovina, with citadel high above town on top of pyramidal-shaped steep hill, enclosed with approximately 1,300 metres long defensive walls,. It is one of the best preserved fortified capitals of the Bosnian Kingdom, the last stronghold before the kingdom dissolved under the pressure of military advancement at the onset of Ottoman Empire takeover.
The entire complex of the Walled city of Jajce, with the citadel, city ramparts, watchtower Medvjed-kula, and two main city gate-towers lies on the southern slope of a large rocky pyramid at the confluence of the rivers Pliva and Vrbas, enclosed by these rivers from the south-southwest, with the bed of the Pliva, and east-southeast by the river Vrbas gorge.
The fortress was built by Hrvoje Vukčić Hrvatinić, the founder of Jajce. However, the city became the seat of the Bosnian kings, hence the royal coat of arms decoration on the citadel entrance. A part of the wall was built by the Hungarian King, while the Ottomans erected the powder magazine. The walls are high and the castle was built on a hill that is egg shaped, the rivers Pliva and Vrbas also protect the castle. There is no rampart on the south and west.
Jajce was first built in the 14th century and served as the capital of the independent Kingdom of Bosnia during its time. The town has gates as fortifications, as well as a castle with walls which lead to the various gates around the town. About 10–20 kilometres from Jajce lies the Komotin Castle and town area which is older but smaller than Jajce. It is believed the town of Jajce was previously Komotin but was moved after the Black Death.
The first reference to the name of Jajce in written sources is from the year 1396, but the fortress had already existed by then. Jajce was the residence of the last Bosnian king Stjepan Tomasevic; the Ottomans besieged the town and executed him, but held it only for six months, before the Hungarian King Matthias Corvinus seized it at the siege of Jajce and established the Banovina of Jajce.
Skenderbeg Mihajlović besieged Jajce in 1501, but without success because he was defeated by Ivaniš Korvin assisted by Zrinski, Frankopan, Karlović and Cubor.
During this period, Queen Catherine restored the Saint Mary"s Church in Jajce, today the oldest church in town. Eventually, in 1527, Jajce became the last Bosnian town to fall to Ottoman rule. The town then lost its strategic importance, as the border moved further north and west.
Jajce passed with the rest of Bosnia and Herzegovina under the administration of Austria-Hungary in 1878. The Franciscan monastery of Saint Luke was completed in 1885.
The Walled city of Jajce is located at the confluence of the Pliva and Vrbas rivers. It was founded and started developing in the Middle Ages and acquired its final form during the Ottoman period. There are several churches and mosques built in different times during different rules, making Jajce a rather diverse town in this aspect. It is declared National Monument of Bosnia and Herzegovina, and, as the old Jajce city core, including the waterfall, and other individual sites outside the walled city perimeter, such as the Jajce Mithraeum, it is designated as The natural and architectural ensemble of Jajce and proposed as such for inscription into the UNESCO"s World Heritage Site list. The bid for inscription is currently placed on the UNESCO Tentative list.