The Finnish delegation left Moscow to report to the government in Helsinki. 
 The British Admiralty announced that HMS Royal Oak had been sunk, presumably 
by a U-boat. 
 Two French steamers Louisiane and Bretagne and one British 
steamer Lockavon sunk by U-boats. 
 Signor Bastianini, new Italian ambassador 
arrived in London.  
U-47 
commanded by Günther 
Prien attacks a strongly defended naval base of Scapa Flow in the Orkney Islands 
and sinks the British battleship HMS Royal Oak.  
Go To: 15th 
October Articles:    
 The Second 
Great War.
 Edited by Sir John Hamilton 
 The War Illustrated.
 Edited 
by Sir John Hamilton 
 2194 Days Of War.
 ISBN-10: 086136614X 
 
For a complete list of 
sources