'Wespe' was a German naval operation in support of Finnish naval activity, using the torpedo boats T 30 and T 31 as well as the smaller craft of Korvettenkapitän Dr Emil Kieffer’s 3^rd Minensuch-Flottille, Kapitänleutnant Walter Erich Schneider’s 1^st Raumboots-Flottille and Fregattenkapitän Erich Brauneis’s 24^th Landungs-Flottille to attack the Soviet maritime delivery of supplies and troop reinforcements for the offensive against Viipuri (Vyborg) on the coast of the Gulf of Finland (15/21 June 1944).

This took place in the course of the part of the Soviet 'Vyborg Offensive Operation' to take the offshore islands of the Karelian isthmus. On 15 June the Finnish IV Corps was compelled to withdraw under fire from the Soviet 59^th Army and 21^st Army from the 'VT-linja' to Vyborg. The Soviet ground forces received heavy naval fire support from the battleship Oktyabrskaya Revolutsiya, and in an effort to cover their seaward flank, the Finns used their own light naval forces and two submarines, but also called for German support, which was provided by the vessels above in Vyborg Bay and Koivisto Sound. In an attack by Soviet motor torpedo boats T 31 was lost, and in air attacks on 20/21 June one artillery ferry and the mine transport Otter are sunk and M 29, R 119, R 120 and the motor minesweeper tender Nettelbeck were damaged.

The Soviet landings on Koivisto were delayed but not prevented, and by 23 June the islands had been evacuated and occupied by the Soviets, who are supported by a number of warships including the gunboats Volga, Zeya, Kama and Oka.