The only thing that was "special" is that they received a lot of publicity; as they were an enemy (or the enemy). Otherwise, they were like most other submarines, whether they were the US Gato class, British, Japanese, Italian, or Russian.
German submarines fought a war of Guerre de Course, that is Germany pursued a war against merchant shipping (Commerce Raiding). Nations that do not have a traditionally strong battle fleet (battleships & cruisers) will, by necessity, have to fight a war of Guerre de Course.
U-boats were German.
The "u" stood for "underwater" and the term "u-boats" was and still is used in reference to WWI German submarines.
'U-boats' was the name given to German submarines in both the first and second world war.
U-boat warfare was the German response to the British blockade.
U-boats.
german U-boats were submarines. in German they are called Unterseeboot
U boats
The numbers on German U-Boats represented the model numbers.
german submarines
U boats were invented in 1914 for WW1
U-boats were German.
No. German U-boats had ordinary, Arabic numerals, such U96 and so.
3-11 u-boats
German submarines were referred to as U-boats during the world wars.
There were over 13 classes of U-Boats; see website: U-Boat
U-boats, packs of German U-boats searching for American ships were called wolf packs
GeRmAnY!!!!!!!