Battle of Lake Khasan
The T-26 Model 1933 carried 122 rounds of 45 mm ammunition, firing armour-piercing 45 mm rounds with a muzzle velocity of , or lower-velocity high-explosive munitions. Tanks intended for company commanders were equipped with a radio set and a hand-rail radio antenna on the turret (so called "radio tanks"). Later the hand-rail antenna was replaced with a whip antenna, because experience in the Spanish Civil War and Battle of Lake Khasan showed that the hand-rail antenna drew fire onto commander tanks.