1875 and 1884 altogether 29 gunboats were built. By this A.G. „Weser” started its career as an important constructor of war ships for the Imperial German Navy (1871 – 1918) first and the Kriegsmarine in the Third Reich (1933 – 1945). Altogether A.G. „Weser” built 146 units for the Imperial Navy and 196 units for the Kriegsmarine (Source: Pamphlet 125th anniversary of AG Weser, 1986). After WW II A.G. „Weser” only built a single warship for the German Navy, in 1979/81 the F122-type frigate Niedersachsen in collaboration with frigate general contractor Bremer Vulkan. The share of warships from all delivered new constructions came to about 50% in 1909/10 and increased to nearly 100% in 1916 during World War I. After 1936 it was again about 66% with an increasing share to about 80% in 1938. Construction of warships started in 1936 with the artillery training ship Brummer for the Kriegsmarine, followed by destroyers and U-boats. The last civilian ships built in 1939 were the merchant ships Neidenfels for the German company D.D.G. Hansa and Java for a shipping company in the Netherlands. The latter was the last civilian ship for many years. After that only warships were constructed, mainly U-boats and some destroyers. The first U-boats constructed were UB I series. Later also UC I, UB II and UC II series were constructed at AG „Weser”. By 1917 most of the work went into the construction of the UB III. Later three UC III were ordered. but were never finished. During World War I, AG „Weser” launched a total of 96 U-boats. Because of intensive construction of warships, A.G. „Weser” was often the target of Allied air-raids during the Bombing of Bremen in World War II, mainly in 1944 and 1945. But despite many buildings, workshops, magazines, slipways and docks as well as ships and U-boats under construction were damaged, in most cases production could be continued within some weeks. The estimated reduction of construction capacity at the end of war seemed only less than 30%. In March 1944 the building of the bunker Hornisse (Eng. Hornet) was started near the shipyard. Well-protected from air attacks, it was intended to produce U-boat sections in. These prefabricated sections were then shipped to the U-boat pen Valentin about 30 km downstream the river Weser. Together with parts from Kriegsmarinewerft Wilhelmshaven and under management of Bremer Vulkan beginning end of 1945 monthly 3