Naval stuff I didn't know: The Japanese navy patrolled Med during WWI, and the Nazis planned a fleet of aircraft carriers

Paul
Kennedy reports that
in World War I, when the Japanese were allied with the UK, they patrolled the
Indian Ocean at the request of Britain. They also "dispatched a dozen
destroyers for anti-submarine work in the Mediterranean," he notes.

Nor
did I know that in the German defense plan of 1938 called for it to build four
aircraft carriers.

Finally,
I learned that during World War II, more German U boats were sunk by Allied
aircraft (288) than by surface ships (246). (Another bunch were deep-sixed by
combined actions.)