High Quality Content by WIKIPEDIA articles! The German navies—specifically the Kaiserliche Marine and Kriegsmarine of Imperial and Nazi Germany, respectively—built a series of battleships between the 1890s and 1940s. To defend its North and Baltic Sea coasts in wartime, Germany had previously built a series of smaller ironclad warships, including coastal defense ships, and armored frigates. With the accession to the throne of Kaiser Wilhelm II in 1888, the Kaiserliche Marine began a program of naval expansion befitting a Great Power. The navy immediately pushed for the construction of the four Brandenburg-class battleships, after which soon followed five Kaiser Friedrich III-class ships. The appointment of Admiral Alfred von Tirpitz to the post of State Secretary of the Navy in 1897 accelerated naval construction. Tirpitz`s "risk theory" planned a fleet that would be sufficiently powerful so that Great Britain, then the world`s preeminent naval power, would avoid risking war with Germany in order to preserve its superiority.