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Toruń Fortress : ウィキペディア英語版
Toruń Fortress

Toruń Fortress (Festung Thorn), built from 1872–1894 by the Kingdom of Prussia and located in Thorn (Toruń, now Poland), is one of the largest fortresses in Central and Eastern Europe. The fortress complex – a chain of forts surrounding the city, as well as numerous smaller fortifications supplementing it – was intended to defend the eastern border of Prussia (with the Russian Empire). Despite much planning and investment,〔 / (The Toruń Fortress ) at torun.pl〕 the fortress did not play a significant role in the First World War nor in any later conflict.〔 (Description ) at Toruński Serwis Turystyczny〕
==History==

Thorn was an important town located just north of the border between Prussia and Russia, which runs from southwest to northeast, in the north along the Drewenz (Drwęca) tributary of the Vistula River which passes through Thorn. With improvements in artillery techniques, including the introduction of rifled barrels and smokeless powder), the old city walls dating from the 18th century no longer provided sufficient protection for the town.
The Prussian government started the construction of fortifications in 1872, at first using French prisoners of war taken during the Franco-Prussian War. The goal was to build a chain of forts surrounding the town of Thorn. The initial plans called for five main forts and two medium ones to be constructed. In the period of 1877–1884, forts II and XI were constructed, followed by forts IV, V, VII, XV, XIII and IX. Continuing changes in artillery and siege techniques, especially the introduction of an anti-building shell in 1883, rendered some of the plans for the fortress obsolete even before it was finished. For that reason, the importance of the main artillery forts was lessened in favor of infantry forts; some artillery forts were redesigned into infantry forts and more small fortifications were constructed. Over time the number of objects to be built increased. In the years 1888–1893, forts III, VI, VIII, X, XII and XIV were added. The last to be constructed was fort I, which was the most technically advanced one. Within 32 years, about 200 fortifications were constructed. Primarily the fortress consisted of seven main forts, six medium-sized ones, six artillery batteries, 32 infantry shelters, and 52 mid-field shelters (used for artillery and ammunition sheltering).
The Thorn Fortress complex would be constantly modernised by the Prussian government, for the last time in 1914 – just before the start of the First World War. The majority of the forts were equipped with wing artillery batteries – armor artillery batteries between forts XI, XII, XII and XII, XIII, XIV, and an experimental artillery battery in fort XI. New observation points for infantry and artillery were also added. Exits from them were designed in a labyrinthine scheme, to reduce the effects from the explosions' blast waves.
The fortress was commissioned by the Prussian government; it would cost over 60 million German gold marks until 1914. About 30% of Thorns infrastructure was related to the fortress, and about 25% of the city's population were employed by the fortress. Despite that investment, it was never besieged by Russian forces and took no significant part in the First World War. After the war it became a part of the Second Polish Republic. In 1971 the fortress was officially declared a monument by the Polish government.
During the Second World War, some of the forts were used by the Germans as POW camps, collectively known as Stalag XX-A.

抄文引用元・出典: フリー百科事典『 ウィキペディア(Wikipedia)
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