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In page U-boat:

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The Pour le Mérite, the highest decoration for gallantry for officers, was awarded to 29 U-boat commanders.[citation needed] Twelve U-boat crewmen were decorated with the Goldenes Militär-Verdienst-Kreuz, the highest bravery award for noncommissioned officers and enlisted men.[7] The most successful U-boat commanders of World War I were Lothar von Arnauld de la Perière (189 merchant vessels and two gunboats with 446,708 tons), followed by Walter Forstmann (149 ships with 391,607 tons), and Max Valentiner (144 ships with 299,482 tons). Their records have not been surpassed in any subsequent conflict.