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In 1906, William IV had the old castle demolished and a new one constructed in its place, designed by the Munich-based architect Max Ostenrieder and the local Pierre Funck-Eydt.
The breakthrough ceremony was held on 12 December 2002, with Grand Duke Henri detonating the explosive charge that connected the two ends of the tunnels.
The German Confederation, founded in 1815, was initially not in need of a navy, as it could rely on three members who commanded large fleets: The Grand Duke of Luxembourg as commander of the Royal Dutch Navy, the Duke of Holstein as the commander of the Danish Navy, and last but not least, the King of Hanover as commander of the British Royal Navy.