Conversation so far:
Is there anything interesting about Erich Ludendorff's Pre-war military career?
In 1885, Ludendorff was commissioned as a subaltern into the 57th Infantry Regiment, then at Wesel.
Where was he based after that?
Over the next eight years, he was promoted to lieutenant and saw further service in the 2nd Marine Battalion, based at Kiel and Wilhelmshaven.

Question: What was his highest rank?
Self-contained rewrite: What was Erich Ludendorff highest rank?