Grudziądz Citadel

On the highest point of the Vistula escarpment, 60 metres above the river, the Prussians built a fortress that Napoleon's army never managed to take. Grudziądz Citadel is the heart of the Grudziądz Fortress – a ring of forts around the town – and it is still a military site today. That is exactly why it survives in such good shape: bastions, ravelins, a dry moat and kilometres of underground galleries look as if the garrison had only recently marched out.

History: Frederick the Great's fortress

After the First Partition of Poland, Grudziądz became part of Prussia, and King Frederick II needed a fortress to guard the lower Vistula and the routes between Pomerania and East Prussia. Construction began on 6 June 1776 on a plateau about 1.5 km north of the centre; Paul von Gontzenbach is regarded as the designer, and the king corrected the plans himself. At its peak almost 7,000 people worked on site. When bricks ran short, the Teutonic Order castles in Grudziądz and Rogóźno were pulled down, and in total some 11 million bricks went into the walls. The fortress was finished in 1789, at almost twice the estimated cost.

Its most famous chapter came in 1806–1807. Governor Guillaume de l'Homme de Courbière held the citadel against French, Hessian and Polish troops, even though many Poles in his own garrison deserted to the besiegers. The final assault never happened – it was called off by the armistice that preceded the Peace of Tilsit. Grudziądz was one of the few Prussian fortresses Napoleon's army failed to capture, and Germans long called it Feste Courbière.

What to see

The keep (donjon) survives with its full ring of ramparts, casemates and both gates. In the courtyard, look for the two-storey Great Magazine and the classicist commandant's building. All five bastions and four ravelins remain, along with the counterscarp gallery and the countermine tunnels – of more than 56 km originally planned, only about 1.2 km were ever dug. Around a thousand bats hibernate in the disused galleries. Between Czwartaków, Saperów and Jagiełły streets lies the Hornwork, an outer defence built in 1788–1789 facing the town.

Interesting facts

• The stone marking the start of construction still stands inside the keep.
• After the November Uprising of 1830–1831, Polish soldiers were interned here, and in the 19th century the citadel also served as a political prison.
• In December 1870, French prisoner of war Colonel Félix Gustave Saussier escaped from here.
• In 1945 the Germans declared the town a fortress; General Ludwig Fricke surrendered on 6 March 1945, and about 5,000 soldiers were taken prisoner.

Tripto tip

The citadel is an active military site, so you cannot just walk in. In season the RAWELIN association runs guided tours, including Saturdays from May to September at 11:00, and there are occasional open days, for example on 3 May and 11 November. Documents are checked at the gate, photography on military ground has been banned since 2025, and rules for foreign visitors are very strict – check dates, fees and requirements with RAWELIN before you travel. Allow about 2–2.5 hours, and bring a torch and sturdy shoes, as the tunnels are dark and uneven. Outer forts such as Fort Wielka Księża Góra or Fort Tarpno can be seen without formalities along the walking and cycling trail around the town.