In June 1942, kapitan Ivan Gorbachev served in 71 IAP-KBF, which still was partially equipped with Polikarpov I-153s

Between 00:30-01:15 on 3 June 1942, four I-153s from the 71 IAP-KBF were up against He 111s raiding Kronstadt.
At 01:10, kapitan Konstantin Solov'yev and starshiy leitenant Aleksandr Baturin claimed one He 111 from a distance of 500-600m at an altitude of 800m. The burning bomber crashed into Lake Kopenskoe. They also claimed a second shared He 111, which they attacked and shot down near Shepelev lighthouse. It seems that these victories were recorded as one single victory each.
Major Vladimir Koreshkov and kapitan Gorbachev claimed a shared He 111 at an altitude of 1000-800 m and from a distance of 100m, which crashed near Inoniemi. They also shot down a second He 111, which fell at Tyvola.

During the night of 5 June, pilots from the 71 IAP-KBF made seven sorties against a reported 35 He 111s and Ju 88s that were attacking the southern forts of Kronstadt.
Five He 111s were claimed by the Soviet pilots when Ivan Serbin claimed one shared bomber with kapitan Petr Biskup and a second with major Aleksandr Alekseyev. Starshiy leitenant Aleksandr Baturin and kapitan Gorbachev claimed one He 111 each. The fifth was claimed by kapitan Biskup.

Gorbachev ended the war with 1 biplane victory and a total of 7.

Claims:

Kill no.	Date	Time	Number	Type	Result	Plane type	Serial no.	Locality	Unit
	1942
	03/06/42	00:30-01:15	1/2	He 111	Shared destroyed	I-153		near Inoniemi	71 IAP-KBF
	03/06/42	00:30-01:15	1/2	He 111	Shared destroyed	I-153		Tyvola	71 IAP-KBF
1	05/06/42	night	1	He 111	Destroyed	I-153		Kronstadt area	71 IAP-KBF

Biplane victories: 1 and 3 shared destroyed.
TOTAL: 7 and 5 shared destroyed.

Sources:
Airmen of World
All aces of Stalin 1936-1953 – Mikhail Bykov, 2014
Black Cross/Red Star Volume II - Christer Bergström and Andrey Mikhailov, 2001 Pacifica Military History, ISBN 0-935553-51-7
Soviet Aces of World War 2 - Hugh Morgan, 1998
Stalin's Eagles - Hans D. Seidl, 1998 Schiffer Publishing, ISBN 0-7643-0476-3
Stalin's Falcons - Tomas Polak and Christhoper Shores, 1999 Grub Street, London, ISBN 1-902304-01-2
Suomen Ilmavoimat part IV – 1942 – Kalevi Keskinen and Kari Stenman, 2007, ISBN 978-952-99743-2-0