This is not a Kansas story; too bad, because a German submarine on the Kansas or Missouri Rivers in 1916 would have been a big story, if somewhat improbable.
In that year the German submarine Deutschland did come to the United States not once but twice. The first trip was in July, with a trip to Baltimore. The second trip was in November, sailing to New London, Connecticut. This second trip was marred by the accidental sinking of a tug that the sub rammed while leaving New London, killing five men aboard the tug.
Mystic Seaport has posted an article about the Deutschland and its New London visit: http://research.mysticseaport.org/news/german-submarine-in-new-london-1916/
For more about the Deutschland itself, see: https://en.wikipedia.org/wiki/German_submarine_Deutschland