They hunted in formations known as 'Wolfpacks' and most of them were build after the Plan-Z initiation. The backbone of the Kriegsmarine were their trademark 'U-boats' (Submarines), which contributed to millions of shipping lost by the allied nations by sinking many cargo ships.

Serving under the Nazi Germany it fought in the Spanish Civil War and the WWII.

The superseder of the Kaiserliche Marine was the Kreigsmarine (War Navy). In the First World War, the Kaiserliche-Marine would go on to become the first largest naval fleet of the war, second only to the British Royal Navy.

The key figure of this expansion was Admiral Alfred von Tirpitz, who greatly expanded the size and quality of the navy. In its later years it received a huge expansion programme from then-Kaiser Wilhelm II who wanted to compete with his cousin King George V of Britain and enlarged its mission.

It was known as the 'Imperial German Navy' or in German 'Kaiserliche Marine' (Kaiserlike Marine( The Kaiser or der Kaiser was the ruler of germany)). In the formation days of the German Empire, the Navy started of from a small Prussian coastline which joined German Empire. Throughout the Naval history of Unified Germany, the German Navy was a formidable force in the open seas.

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