In November 1939 the Soviet Union invaded Finland, and the
Winter War broke out. Still holding his post on the
Leningradsovet, Amelko was assigned to command the landing craft in an amphibious assault on
Seskar. After completing the task successfully, he was appointed executive officer of the
Leningradsovet, and then her commander. He commanded her for training voyages, taking cadets into the
Baltic and the
North Seas, and was still her captain when in June 1941,
the Axis invasion of the Soviet Union began. Amelko oversaw the hasty armament of his ship with anti-aircraft guns and machine guns, using them to counter
enemy air attacks while based in
Tallinn. A group of 20 sailors and petty officers were also deployed from the ship to bolster the city's defences. With the Soviet position fast deteriorating by August 1941,
a risky naval evacuation began.
Leningradsovet and other ships based in the city evacuated large numbers of people and equipment from the city, undertaking a dangerous voyage to Kronstadt through mined waters, and while under heavy air attack.
Leningradsovet provided anti-air gunfire, but suffered several personnel wounded, among whom was Amelko. Nevertheless, they were able to rescue 400 people from sinking ships, and reached Kronstadt. For his performance in the battle, Amelko was awarded the
Order of the Red Banner, and an early promotion to the rank of
captain-lieutenant. Amelko now found himself based in
Leningrad as
the city endured a 900-day siege.
Leningradsovet was sent to bolster its air and artillery defences, and to carry out reconnaissance missions. In January 1942, Amelko was appointed commander of a division of
net layers, and then of
minesweepers which had been converted to lay
smoke screens. The smoke screens provided coverage for the fleet during air and artillery attacks, and allowed ships to operate between Leningrad and Kronstadt, and into the
Gulf of Finland to carry out reconnaissance missions and to land troops behind enemy lines. Some instances, such as the landings on the island of during the , turned into fraught battles with German ships. In winter when the gulf froze over, sailors transferred to using
aerosledges to provide smoke screens. In late 1943 they supported the crossing of General
Ivan Fedyuninsky's
2nd Shock Army from
Lisy Nos to the
Oranienbaum Bridgehead, beginning operations to lift the siege of Leningrad. For their efforts during the war, the smoke screen boat division was awarded the Order of the Red Banner, and Amelko received the
Order of Nakhimov, 2nd class. Following the lifting of the siege, and the advance of Soviet forces pushing the enemy out of the areas they had occupied, Amelko was appointed in early spring 1945 to be chief of staff of the Kronstadt Naval Defence Region's minesweeping brigade. This consisted of 12 divisions, amounting to 157 ships and boats, working to clear the area of the several hundred thousand mines of various types which had been laid during the war, a task only deemed completed in 1953. ==Postwar service==