Question: Princess Christina Margarethe of Hesse, was the eldest daughter of Prince Christoph of Hesse, was the fifth son of Prince Frederick Charles of Hesse and Princess Margaret of Prussia, he was a German SS officer killed accidentally, during which historic event?
Sentence (from "Prince Friedrich Karl of Prussia (1828–85)"): Prince Frederick Charles was a grandson of King Frederick William III of Prussia and a nephew of Frederick William IV and William I.
Relevant evidence: No