In December 1939, Kapitan K. P. Sokol served in the 1./145 IAP. This unit was at the time still equipped with I-152s.

At 12:30 on 24 December 1939, Junkers K.43 JU-126 of LLv 16 was shot down in the Märkäjärvi/Salla area by Kapitan K. P. Sokol of 1./145 IAP. The Junker had been on a reconnaissance mission between Rovaniemi and Salla and the pilot vääpeli Kauko Hyytiänien managed to parachute but luutnantti Erkki Alanen (observer), alikersantti Paavo Kaurto (gunner) and mechanic Mikko Majuri were killed.
At this time this aircraft was the sole Finnish aircraft in the area.

Sokol ended the war with 1 biplane victory.

Claims:

Kill no.	Date	Time	Number	Type	Result	Plane type	Serial no.	Locality	Unit
	1939
	24/12/39	12:30	1	Junker K.43	Destroyed	I-152		Märkäjärvi	1./145 IAP

Biplane victories: 1 destroyed.
TOTAL: 1 destroyed.
(a) Junkers K.43 JU-126 of LLv 16 shot down.

Sources:
Gloster Gladiator and Hawker Hart: In Combat with the Swedish Voluntary Wing F19, Finland 1940 - Mikael Forslund, 2009 Mikael Forslund Produktion, ISBN 978-91-977677-1-2
Suomen Ilmavoimat part II – 1928-40 – Kalevi Keskinen and Kari Stenman, 2006, ISBN 952-99743-0-2