The great Austrian naval bases of Cattaro and Pola were visited several times by Italian airmen. On one occasion a raid was made on the former harbour at night and direct hits were scored on submarines and torpedo-boats, while an aerial attack on Pola was responsible for the destruction of three U-boats undergoing repairs. It is only doing bare justice to remember that neutral aviators also played a part in making a life under the rolling deep in a U-boat anything but pleasant. Time and again German pirates endeavoured to use the deep fiords of North-western Scandinavia for purposes best known to themselves, but in all probability as convenient rendezvous for stabbing Norwegian vessels in the back. Several tried to hide themselves in Bergen Bay. They were discovered by native airmen and promptly informed that if they did not quit the neutral zone without delay they would be interned. They left. CHAPTER X _U-Boats that Never Returned_ “_Let us march farther, undaunted and confident, along the road of force. Then our future will be secure against British avarice and revenge. The German is too good to become England’s vassal._”—ADMIRAL VON SCHEER. Many U-boats were buried in the same grave as their last victim. This was not adequate retribution, but it left the Navy and the Mercantile Marine with one submarine the less to fight. Close to the wreck of the great White Star liner _Justicia_, a magnificent steamer of 32,000 tons, lie the remains of one of her attackers. There may be others, but I give the official figure. The submarine in question was sunk by the destroyer _Marne_ on the 20th June, 1918, the day the Germans were being driven back across the historic river whose name she bore. The _Justicia_ was dogged by submersibles for twenty-two hours, during which time no fewer than seven torpedoes were fired at her. It was the most determined onslaught ever made by U-boats. Moreover, the attack is remarkable by reason of the fact that not only were destroyers and other craft convoying the vessel, but she herself was armed.