In a battle with the British Q-ship HMS Prize, commanded by Lieutenant William Edward Sanders, SM U-93 was badly damaged.
[5] Baron von Spiegel operated in the consulate building "Van Benthuysen Elms Mansion".
He is believed to have briefed German submarines in the Gulf of Mexico via radio about merchant vessels leaving the port of New Orleans for England.
After World War II he claimed that this destruction was necessary because of risk of disease and because of the "security of the (German) troops.
Baron Edgar von Spiegel wrote several, mostly autobiographical, books about his experiences in the Imperial German Navy.
Erlebnisse eines Seeoffiziers im Aufstande auf den Karolinen (War pictures from Ponape.
The book sold 360,000 copies in Germany and was one of the most widely spread works of German World War I literature.
[10] It was used as a template for Gerhard Menzel's screenplay of the movie Morgenrot (1933) about the fate of a German submarine in World War I.
He translated Lowell Thomas' Raiders of the Deep (1928), a book about Submarines in World War I, and wrote a romance novel in a south sea surroundings (Das Maedchen unter den drei Baeumen - The girl under the three trees, 1930).