From 1912 to 1916 he served aboard a training ship, armored cruiser General-Admiral class Gerzog Edinburgski, next, armoured cruiser, Rossiya, battleship Tsarievitch, and submarines Akula, Bars and S-12.
Berg joined the Imperial Russian Navy in 1914 and served as junior navigating officer on the Russian battleship Tsesarevich and as liaison officer on the British submarine HMS E8, which was operating in the Baltic in alliance with Russia.
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