Question: Oscarsborg Fortress is best known for sinking the  German heavy cruiser named for the Prussian victor of what?
Sentence (from "German cruiser Blücher"): Blücher was the second of five "Admiral Hipper"-class heavy cruisers of Nazi Germany's "Kriegsmarine", built after the rise of the Nazi Party and the repudiation of the Treaty of Versailles.
Relevant evidence: Yes