British made Bristol Blenheim light bomber aircraft of Finnish Air Force coming in for a landing on Luonetjärvi airfield (now Jyväskylä Airport), between 28 March 1944 and 31 March 1944. The yellow stripe at the tail of this Finnish plane was the designation for the German Eastern Front. The British-made Bristol Blenheim light bomber represented the 1930s mindset that newer bombers would be protected from fighter attack by their increased speed. Finland’s interest in this model grew during the early 1930s and they received their first Blenheims in 1937. By that time it had become apparent that the Blenheim’s speed advantage, compared to modern fighters, had already vanished. Additionally, the plane’s defensive armament, consisting of one or two wingmounted, forward facing machine guns, and one machine gun operated by a rear gunner, was insufficient for the demands of the time.
Book "Finland at War: The Winter War 1939-40" by Vesa Nenye, Peter Munter & Toni Wirtanen