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Overview of engagements

German U-boats commissioned	1.155 U-boats
U-boats built in Germany having executed combat patrols	863 U-boats
Of those 863 U-boats the following engagements were recorded
Enemy contact and one or more sinkings	462 U-boats
Enemy contact, but no sinkings	401 U-boats
Of those 462 U-boats with sinkings the following rates of success were recorded
1-5 sinkings	307 U-boats
6-10 sinkings	72 U-boats
11-19 sinkings	45 U-boats
20 and more sinkings	38 U-boats

U-boats lost during their first combat patrol	210 U-boats
2% of all UBoat-Commanders reached 30% of all sinkings

Areas of losses of U-boats in combat missions

Area	U-boats tasked	Remarks	Total
North Atlantic	284
Middle Atlantic	47
South Atlantic	15	Incl. UIT-22 off the Cape of Good Hope
Biscaye	56
		Total of U-boats at the Atlantic Ocean	401
English Channel	34
British coastal waters	14
Off the Faero Islands	13
Off the Shetland Islands	6
At the Irish Sea	11
Off the Hebridies	5
Northern Approaches	3
		Total of U-boats around Britain	86
Mediterranean	51
Straits of Gibraltar	5
		Total of U-boats in the Med	56
Northsea	16
off Norway	35
Polar Sea	26
		Total of U-boats in Northern waters	77
Carribean	6
Gulf of Mexico	2
Florida Straits	1
Off Cape Hatteras	3
Off the US Eastcoast	2
		Total of U-boats off America	14
Far East	5
Indian Ocean	5	Incl. UIT-23 in the Malacca Straits
		Total of U-boats in the Indian Ocean and Far East	10
Baltic Sea	17	* see below	17
		Total losses in combat missions	662

* The difference between the upper most table (total of line 3 -13) with 652 U-boats and the above table with 662 U-boats came into exist, because the latter included the losses of 10 U-boats in the Baltic Sea, which are shown in line 18 und 19.