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In page Whaling:

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Originally one of the most successful whaling nations, German whaling vessels started from Hamburg and other smaller cities on the Elbe River, hunting for whales around Greenland and Spitsbergen. While 1770 is recorded to have been the most successful year of German whaling, German whaling went into steep decline with the beginning of the Napoleonic Wars and never really recovered. After the Napoleonic Wars, Germany tried but could never re-establish a successful whaling industry.[citation needed]