5th Fighter Group "Kos"
The 5th Fighter Group "Kos" was a short-lived Polish fighter unit that served with the French Air Force during the Battle of France in 1940.
Last updated August 31, 2026
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Overview
The 5th Fighter Group "Kos" was a Polish fighter formation created in France during the Battle of France in the Second World War. Known in Polish as V Klucz Kominowy „Kos”, it operated under the Polish Air Forces in France while forming part of Fighter Squadron 1/55 of the French Air Force. The group was organized in the second half of May 1940, at a moment when German forces were advancing rapidly through France and Allied air units were being assembled or redeployed to support the French campaign. The unit was composed primarily of Polish pilots who had graduated from fighter-pilot training at Avord in France. It was commanded by Captain Bronisław Kosiński and based at Bourges. Its principal operational responsibility was the air defense of the nearby Hanriot aircraft factory, an important French aviation-production site. The group flew Curtiss P-36 Hawk fighters, an American-designed type operated by the French Air Force during the campaign. The 5th Fighter Group "Kos" flew its first mission on 24 May 1940. During that sortie, its pilots claimed one German aircraft destroyed and two more damaged. Between its first operation and 17 June, the unit carried out approximately thirty missions. Its recorded results amounted to three and two-fifths aerial victories and three and three-fifths aircraft damaged. The fractional figures reflect the period's method of allocating shared or collaborative claims rather than individual, whole-number victories. The formation reportedly suffered no casualties during its existence. Its operational career ended in late June 1940, shortly before France capitulated. As the French military position collapsed, the unit's personnel evacuated to Algeria. They were subsequently transported by ship to the United Kingdom, where they joined the Royal Air Force. The group therefore represents one of the Polish aviation formations that fought in France before continuing the Polish air effort from Britain. It was a wartime military unit rather than a commercial brand, company, or consumer-facing organization.
History
The 5th Fighter Group "Kos" was formed by the Polish Air Forces in France during the second half of May 1940, while the Battle of France was underway. The formation was incorporated into Fighter Squadron 1/55 of the French Air Force. Its personnel were mainly Polish pilots who had recently completed fighter training at Avord. Captain Bronisław Kosiński commanded the group. Based at Bourges, the unit operated Curtiss P-36 Hawk fighters. Its assigned role was to protect the surrounding area and, in particular, the nearby Hanriot aircraft factory. The factory's location made local air defense an important task as German forces advanced and the French aviation infrastructure came under pressure. The group flew its first mission on 24 May 1940. During that operation, it was credited with shooting down one German aircraft and damaging two others. By 17 June, it had completed approximately thirty missions. Its recorded combat results were three and two-fifths aerial victories and three and three-fifths enemy aircraft damaged. These fractional totals reflect shared wartime claim accounting. The unit did not lose personnel to casualties during its brief operational existence. The worsening military situation led to the formation's dissolution in late June, shortly before the capitulation of France. Its soldiers first evacuated to Algeria and were then transported by sea to the United Kingdom. There they joined the Royal Air Force, continuing their service within the broader Polish contribution to Allied air operations. The 5th Fighter Group "Kos" was consequently active for only a few weeks, but its history links the Polish air effort in France with the later Polish aviation presence in Britain.
- 1940
Formation in France
[1]The 5th Fighter Group "Kos" was formed in the second half of May as a Polish unit attached to Fighter Squadron 1/55 of the French Air Force.
- 1940
First mission
[1]On 24 May, the group flew its first mission and recorded one German aircraft destroyed and two damaged.
- 1940
Operational activity at Bourges
[1]By 17 June, the unit had flown around thirty missions in defense of the Bourges area and the Hanriot factory.
- 1940
Evacuation and dissolution
[1]In late June, shortly before France capitulated, the unit evacuated through Algeria and was later transported to the United Kingdom, where its personnel joined the Royal Air Force.
Products and positioning
A wartime Polish fighter unit assigned to the defense of the Bourges area and the nearby Hanriot aircraft factory during the Battle of France.
Fighter aircraft
Curtiss P-36 Hawk
The Curtiss P-36 Hawk was the fighter aircraft operated by the group during its service in France. The American-designed aircraft was used by the French Air Force and equipped the unit for its air-defense and combat missions from Bourges.
Recent events
- 1940
5th Fighter Group "Kos" formed in France[1]
Other
The Polish fighter group was organized in the second half of May as part of Fighter Squadron 1/55 of the French Air Force.
- 1940
First operational mission over France[1]
Other
On 24 May, the group conducted its first mission and recorded one German aircraft destroyed and two damaged.
- 1940
Unit evacuated after the French campaign[1]
Other
Following the collapse of the French position, the group evacuated to Algeria and its personnel later traveled by ship to the United Kingdom to join the Royal Air Force.
Sources1 sources
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