On Dec 19:th, the Swedish Volunteer Corps formed an
aviation unit, initially designated F101,
consisting of a staff unit, fighter squadron, light bomber
group, transport group and ground support unit. Total
staff was about 250 men and two women. A Finnish air order
of Jan 4:th mentioned the unit as Lento R 5, but on Jan 8:th, it was
given the name "19. flygflottiljen" (19:th wing, numbered
in sequence with the wings in Sweden), F 19.
To the air wing was on Dec 30:th assigned
four B 4 Hawker Harts
and twelve J 8A Gloster Gladiators.
The Gladiators were the most modern fighter in Swedish service, and twelve were no less than a third of the total operational fighter force. (More modern fighters were ordered, but not yet delivered.) They were camouflaged with aluminum dope partially over the olive green top surfaces and given Finnish insigninas.
The wing's first operational orders were received from the Swedish Volunteer Corps on Jan 9:th:
Reconnaissance and attack against a Soviet air base on the lake Salmijärvi as well as enemy troops east by northeast of KemiJärvi, and, as far as possible fighter defence of the towns Oulu, Kemi and Tornio;.
The first attack was performed on Jan 12:th by a mixed unit of fighters and bombers against both enemy troops on the move northeast of Kemijärvi and an airbase at Märkijärvi.
During the attack, a Polikarpov I-15 was shot down by a
Gladiator just as it attained a position behind another
Swedish aircraft. Apart from the designated targets, a
Soviet staff unit was also attacked.
Unfortunately, two of the Hawker Harts collided when they manoeuvred to escape anti-aircraft fire from the ground. Of the four air crew, one was found dead in 1942, three made successful parachute jumps. Two of them managed to evade capture for two days and weren't returned to Sweden until May. The third managed to get back to his unit.
Another Hart was damaged by three I-16s and had to make an emergency landing. The two crew managed with the help of the skis always strapped to the fuselage get back to their unit after a few days.
The light bomber group was supplied with one more Hawker Hart, and both of them survived until the end of hostilities on March 12:th, when they were returned to Swedish air force duty. This was the only conflict in which Hawker Harts were used in combat.
During intense combat near Kemijärvi on Jan 23:rd,
two Gladiators were lost and one of the pilots were
killed. Another Gladiator crashed during a check flight on
March 10:th and killed both aboard. The remaining nine
Gladiators returned to Swedish service.
Soviet losses in the air to F 19 were six fighters and six bombers.
Sources: Gösta Norrbom: Att flyga är att leva; Kontakt #70, #79; Greger Falk: F 19 - En krönika
Further information: Håkan's Aviation Page: F 19 calendar and F 19 in the Winter War.