England's Distress: Postcard map of England and Ireland with the restricted zone Germany proclaimed around the islands, showing the ships destroyed by submarine in the 12 months beginning February 1, 1917.
Englands Not12 Monate uneingeschränktenU-Bootskrieges auf dem nördlichen See kriegsschauplatzAlle durch Minen und vor dem 1. Februar 1917 vernichteten Schiffe sind in dieser Karte nicht enthalten.SperrgebietsgrenzenBedeutet ein durch die Tätigkeit unserer U-Boote versenktes Schiffe ohne Berücksichtigung seine GrosseDie Eintragungen der Schiffe entsprechen dem Versunkungsort.England's distressUnqualified 12 monthsSubmarine warfare in the North Sea theaterAll ships destroyed by mines of before February 1, 1917 are not included in this map.restricted zone boundaries[Sunken ship symbol] indicates a ship sunk by the actions of our submarines without taking into account the size of the vessel. The records correspond to the ships' place of operations.Reverse:Auf Anregung Sr. Majestät des Kaisersi. Auftr. des Admiralstabes d. Rais. Marine zu Gunsten der Sinterbliebenen der Besatzungen von U-Booten, Minensuch- und Vorpostenbooten herausgegeben vom Verein für das Deutschtum im AuslandFaber'sche Buchdruckerei, Magdeburg.At the suggestion of His Majesty the Emperorhis commission of Naval Staff Rais d. Navy issued in favor of the sintering relatives of the crews of submarines, minesweepers and outpost boats by the Association for Germans abroadFaber'sche book printing, Magdeburg.
"What was the German U-boat strength as they prepared to embark on a second submarine campaign? In March 1916 there were 52 operational boats, compared to 29 to 30 at the start of the first campaign. There were 16 U-boats in the North Sea, 20 in the Flanders Flotilla (8 UB.I, 4 UB.II, and 8 UC.I), 4 in the Baltic, 7 in the Adriatic, and 5 at Constantinople. The Germans could reasonably expect 38 of the U-boats under construction to enter service in the period between April and August of 1916."
The UC submarines were smaller, mine-laying vessels.
A Naval History of World War I by Paul G. Halpern, page 306, copyright © 1994 by the United States Naval Institute, publisher: UCL Press, publication date: 1994
U-boat, submarine, 1916, March, 1916-03-25