Soviet Pacific Fleet[1] Far Eastern Front Ranam-guyok Military District 3rd Army Second Sino-Japanese War Taishō period Shōwa period Asia-Pacific Mediterranean and Middle East Other campaigns Coups The Seishin Operation (Russian: Сэйсинская операция, romanized: Seysinskaya operatsiya, Korean: 청진 상륙 작전), also called Chongjin Landing Operation, was an amphibious assault on northern Korea between 13–17 August 1945, carried out by the forces of the Soviet Northern Pacific Flotilla of the Pacific Fleet during the Soviet–Japanese War at the end of World War II.

During the Soviet invasion of Manchuria in August 1945, the 1st Far Eastern Front under Kirill Meretskov advanced south along the coast of northern Korea.

Encouraged by the success, the fleet commander, Admiral Ivan Yumashev ordered the launch of the next amphibious assault at the port of Seishin (now Chongjin).

To compensate for his small force, he ordered powerful pre-strikes of aviation and torpedo boats on the port (daily bomb-assault strikes from 9 to 13 August).

As a result, it was decided to start the operation, without waiting for the final completion of the battle in Racine and the redeployment of the light forces of the fleet there.

Therefore, the starting point for the operation remained Vladivostok, significantly remote from Seishin, which immediately deprived the Soviet command of the ability to quickly respond to a changing situation.

The assault force easily occupied the port and the surrounding urban areas, taking advantage of the enemy's complete surprise.

During the night, the paratroopers fought an extremely fierce battle in three separate groups, beating off continuous counterattacks and soon lacking ammunition.

On the morning of 14 August, the reinforcement convoy reached Seishin and landed a battalion of marines (710 men under command of Major M.P.

Only part of the battalion led a defensive battle at the piers, several more groups of soldiers were cut off from their unit and fought separately in high-rise buildings in the city.

A volunteer detachment (25 men, commander of the 3 rd rank GV Ternovsky) hastily formed from the crews of the ships, landed on the shore.

Only in the middle of the day with the help of tanks and artillery fire from the ships that damaged the Japanese armored train, which was forced to leave the battlefield, the port was finally cleared and the fighting began to take the city.

In the afternoon, another detachment of ships left Vladivostok (one destroyer, two minesweepers, three transports, one patrol and border boat), carrying the third echelon of assault forces: 615 soldiers, 60 guns and mortars, 94 cars.

On 17 August, the ships that had left Vladivostok the previous day, arrived at the port and the landing of the troops was carried out safely.

Around 11:30, a forward detachment of the 25th Army under command of Colonel General Ivan Chistyakov of the 1st Far Eastern Front reached the positions of the landing force.