<a href="https://en.wikipedia.org/wiki/German_cruiser_Bl%C3%BCcher" class="extiw" title="en:German cruiser Blücher">The cruiser <i><b>Blücher</b></i></a> (launched 1937), the lead ship of the German armada headed for Oslo, Norway, was sunk in <a href="https://en.wikipedia.org/wiki/Oslofjorden" class="extiw" title="en:Oslofjorden">the Oslofjord</a> by Norwegian military at <a href="https://en.wikipedia.org/wiki/Oscarsborg_Fortress" class="extiw" title="en:Oscarsborg Fortress">Oscarsborg Fortress</a> during <a href="https://en.wikipedia.org/wiki/Battle_of_Dr%C3%B8bak_Sound" class="extiw" title="en:Battle of Drøbak Sound">the Battle of Drøbak Sound</a> on 9 April 1940, the first day of the <a href="https://en.wikipedia.org/wiki/Operation_Weser%C3%BCbung" class="extiw" title="en:Operation Weserübung">German invasion of Norway</a> (part of <a href="https://en.wikipedia.org/wiki/Norwegian_Campaign" class="extiw" title="en:Norwegian Campaign">the Norwegian Campaign</a> in <a href="https://en.wikipedia.org/wiki/World_War_II" class="extiw" title="en:World War II">World War II</a>). By sinking the ship <a href="https://en.wikipedia.org/wiki/Haakon_VII_of_Norway" class="extiw" title="en:Haakon VII of Norway">the Norwegian king</a> and <a href="https://en.wikipedia.org/wiki/Nygaardsvold%27s_Cabinet" class="extiw" title="en:Nygaardsvold's Cabinet">government</a> were saved from being taken captive in the first hours of the invasion. The number of casualties is unknown, but the loss of life probably ranges between 600 and 1,000 soldiers and sailors. The wreck remains on the bottom of the Oslofjord.
Photo from Flickr album "<a rel="nofollow" class="external text" href="https://www.flickr.com/photos/national_archives_of_norway/sets/72157627575723598">Sjøfart i krig</a>" by <a href="https://no.wikipedia.org/wiki/National_Archives_of_Norway" class="extiw" title="no:National Archives of Norway">Riksarkivet (National Archives of Norway)</a>
<a rel="nofollow" class="external text" href="https://www.flickr.com/people/59811348@N05">Riksarkivet (National Archives of Norway)</a> from Oslo, Norway
<a rel="nofollow" class="external text" href="https://www.flickr.com/photos/national_archives_of_norway/5654561805/">Blücher</a>