BT tanks were used in combat on several occasions prior to World War II. A battalion of BT-5s saw action on the Republican side in the Spanish Civil War, where their 45 mm guns could easily destroy the opposing German and Italian light tanks. In the border skirmishes against Japan in 1939, both BT-5s and BT-7s were used. Again the BT generally outclassed the lightweight enemy tanks. Against Finland during the Winter War (mainly BT-2 and BT-5 models) the BT was less successful. The Finnish forces were well-led, highly motivated and defending very constricted terrain. The thinly-armored BTs were very vulnerable to dug-in Finnish antitank guns.
In the Second World War, BT-5s and BT-7s took part in the Soviet occupation of eastern Poland in 1939, and in large numbers in the battles of 1941. Most of these tanks were abandoned or destroyed in the disastrous 1941 campaign. A few continued in use in 1942, but they became quite rare after that time.
The Red Army planned to replace the BT series with the T-34 and had just begun doing so when the German invasion (Operation Barbarossa) took place.
In the Far East, a significant number of BT-7 tanks took part in a blitz campaign against Japan in Manchuria, during August 1945. This was the last combat action of BT-series vehicles.
(This file includes the 1935 and 1937 model tanks. The newer model has a sloped armor turret and I didn't feel that selling them seperately was appropriate. They are 3900 polys each, not total.)
(Low poly and Game Ready!)