The Bristol Blenheim was a British light bomber designed and manufactured by Bristol Aeroplane Company. It was used during the first half of the Second World War by the Royal Air Force (RAF), but by many foreign users too:
- Poland: Reportedly, No.307 (Polish) Night Fighter Squadron operated two Blenheims. One of the Mk.I variant and another of the Mk.IV variant.
Furthermore, one Blenheim ad-hoc converted into VIP transport was used as the personal transport of General Wladislaw Anders, commander of 2nd Polish Corps. As we couldn't find pics of these Blenheims, the drawings should be considered as speculative. - Portugal: In order to honor their ancient alliance, ensure their neutrality and use their bases in the Azores Islands, the Portuguese Government was provided with various British aircraft. Among them was a bath of 12 Blenheim Mk.IVf in September 1943. These were assigned to Esquadrilha B (Squadron B) of the Aviaçao Naval (Naval Aviation - Portuguese Naval Air Arm) which made for its first land-based unit. They were serialled B-1 to B-12 and were based at Portela de Sacavem, in Lisbon.
The Aeronáutica Militar (Military Aeronautics) received ten Mk.IV which were assigned to Esquadrilha ZE (Squadron ZE) based at the town of Ota and commandeered by Captain Joao Jose Ribeiro Ferreira, who died on 30th August 1944 when his Blenheim crashed.
Three additional Mk.Vs were supplemented later. These Mk.Vs flew also with the Aviaçao Naval, though it's not clear if these were the same that had previously belonged to the Aeronáutica Militar. Anyway, the Blenheims remained in service with Portugal until 1948. - Romania: The Romanian Government was among the first customers of the Blenheim Mk.I. They received a batch of 34 Blenheim Mk.I between May and November 1939 to equip their bombing and long range reconnaissance squadrons Nos.1,2,3 and 4 of the Fortele Aeriene Regale ale Romaniei (FARR - Royal Romanian Air Force). When Romania joined the Axis in November 1940, spare parts for British-supplied aircraft became a problem, which was somehow eased with the inclusion of three ex-Yugoslavian Blenheim Mk.I and spares in September 1941.
The Romanian Blenheims saw action during the Barbarossa Campaign, from 21st June 1941 onwards. During the initial opening stages of that campaign, four Blenheim were lost to Soviet anti-air fire. The Blenheims were used in support of Romanian ground troops during the siege of Odessa in 1941. However, logistic problems for the British-supplied aircraft were being felt this early on in the campaign and in late 1941 the FARR was largely withdrawn to rest. By early 1942, only 13 Blenheim were in active, number which was increased, thanks to the work of FARR's mechanics, to 27 later that year.
Escadrila 1's (Squadron 1) Blenheims flew recce missions supporting Axis troops in their assault on Stalingrad. This squadron lost four Blenheim during that campaign and then they withdrew to Ciocarlia, in Romania, where they flew their Blenheim covering the northern areas of the Black Sea. The Blenheims in this squadron remained in active until 23rd August 1944, though, by that date they had only six serviceable machines, and one of them was shot down by friendly fire near Ploesti and other was captured by the advancing Soviet forces.
When Romania switched sides in late August 1944, the three remaining Blenheims were employed for reconnaissance duties. However, they were in such poor condition that they were assigned to transport duties and, eventually, they were withdrawn from active service after an eventful career with the FARR.
Sources:
1. https://en.wikipedia.org/wiki/List_of_Bristol_Blenheim_operators#Poland
2. Hall Park Books - Warpaint 26 - Bristol Blenheim
3. Osprey Publishing - Combat Aircraft 5 - Blenheim Squadrons of World War 2