25th May 1917
Western Front
British advance towards Fontaine-lez-Croiselles.
German success near Braye (Chemin des Dames); French success round Mt. Cornillet (Moronvilliers).
Southern Front
Italian progress on the Isonzo (Plava to M. Kuk), and on southern Carso.
Aviation
German Gotha G.IV conduct a daylight raid on England, killing 95 people and injuring 195, mostly in Folkestone.
Karl Emil Schäfer, German fighter ace with 30 confirmed victories, is shot down and killed in action.
Political, etc.
Mr. Lloyd George issues statement re: submarine menace and food supplies.
Ship Losses:
A. H. Frijs (Denmark) The barquentine was sunk in the Atlantic Ocean 35 nautical miles (65 km) west south west of Suğuroy, Faroe Islands by
SM UC-33 ( Kaiserliche Marine). Her crew survived.
Argentina (United Kingdom) The sailing vessel was sunk in the Mediterranean Sea off Sicily by
SM UC-20 ( Kaiserliche Marine).
Diego Russo (Italy) The sailing vessel was sunk in the Tyrrhenian Sea south west of Policastro Bussentino, Campania by
SM U-65 ( Kaiserliche Marine).
Glyg (Norway) The coaster was sunk in the Atlantic Ocean 17 nautical miles (31 km) north north west of Muckle Flugga, Shetland Islands, United Kingdom by
SM UC-33 ( Kaiserliche Marine). Her crew survived.
HMS Hilary (Royal Navy) The armed merchant cruiser was torpedoed and sunk in the Atlantic Ocean 40 nautical miles (74 km) west of the Shetland Islands (60°33′N 3°00′W) by
SM U-88 ( Kaiserliche Marine) with the loss of four of her crew.
Ida (Italy) The sailing vessel was sunk in the Mediterranean Sea off Sicily by
SM UC-20 ( Kaiserliche Marine).
Kohinur (United Kingdom) The cargo ship was torpedoed and sunk in the Mediterranean Sea 150 nautical miles (280 km) north west of Alexandria, Egypt (33°20′N 29°50′E) by
SM U-38 ( Kaiserliche Marine) with the loss of 37 crew.
Magnus Manson (United States) The five-masted schooner was set afire and sunk in the Atlantic Ocean 50 nautical miles (93 km) west by south of Cape St. Vincent, Spain by
SM U-47 ( Kaiserliche Marine). Her crew survived.
Natale Monaco (Italy) The sailing vessel was sunk in the Tyrrhenian Sea by
SM U-65 ( Kaiserliche Marine).
Nicolino (Italy) The sailing vessel was sunk in the Gulf of Genoa by
SM UC-35 ( Kaiserliche Marine).
Rosina R. (Italy) The sailing vessel was sunk in the Tyrrhenian Sea by
SM U-65 ( Kaiserliche Marine).
Sjaelland (United Kingdom) The cargo ship was shelled and sunk in the English Channel 18 nautical miles (33 km) east by north of Start Point, Devon by
SM UC-66 ( Kaiserliche Marine) with the loss of a crew member.
Unione Salvatore (Italy) The sailing vessel was sunk in the Mediterranean Sea off Sicily by
SM UC-20 ( Kaiserliche Marine).
Vincenzino C. (Italy) The sailing vessel was sunk in the Tyrrhenian Sea by
SM U-65 ( Kaiserliche Marine).
Whinlatter (Norway) The barque was sunk in the Atlantic Ocean (61°04′N 2°53′W) by
SM UC-33 ( Kaiserliche Marine). Her crew survived.