context: Isakov broke away from teaching with the onset of the Winter War and entered active service; he coordinated not only the movement of naval warships in the Baltic Sea but also the ground forces of the Red Army in the Soviet war against Finland.
source: From 1941 to 1943 Isakov was the chief of the Main Maritime Staff.
reference_original: С 1941 по 1943 год Исаков был начальником Главного морского штаба.
reference_flipped: С 1941 по 1943 год Исакова была начальницей Главного морского штаба.