S38b and S100 E-boats class were German fast attack craft (Schnellboot
in German) built for the Kriegsmarine during World War Two.
The E-boats (a British designation using the letter E for Enemy) were
defined by many naval experts as the best carrying out of their
category. Initially these units were called Unterseebot Zerstörer
(Hunting Submarine) and Anti-Submmarine Motorboats or Armored
Motorboats, as they had an important anti-submarine mission. Later the
Kaiserliche Marine (imperial german navy) adopted the designation of
Luftschiffmotorenboot (boat with an airship engine) or L-Boote and,
therefore, from November 1917, the units became LM-Boote, with the same
meaning, but their use, especially in the Baltic Sea and the North Sea,
was not particularly successful.