Not long after the resumption of the German announcement of unrestricted submarine warfare against shipping deemed to be supporting the Allied war effort, after landing 1,000 wounded at Avonmouth in the Bristol Channel, the Asturias was attacked by German submarine off the south Devon coast and struck by a torpedo which blew off her stern, killing 35 of her crew. The Captain of U20 which sank the Asturias was Capitanleutnant Walther Schweiger, who two years before had been in command of the U-Boat which sank the Lusitania. She was able to be beached near Bolt Head but her damage was so extensive that she was declared a total loss. However her hulk was put to use as a floating ammunition store at Plymouth for the rest of the war.