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: De 1941 a 1943 Isakov fue el jefe del Main Maritime Staff.
reference_flipped: De 1941 a 1943 Isakov fue la jefa del Main Maritime Staff.