Poland bought 38 British Vickers Mark E (6-ton) light tanks in 1932, initially all were twin-turret (Type A), but then 22 were converted to single-turret Type B. *
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In 1939 all Vickers E tanks were used in two light tank companies of Polish two motorized brigades: the 121st Company of the 10th Motorized Cavalry Brigade of Col. Maczek, and the 12th Company of Warsaw Armoured-Motorized Brigade (WBP-M) of Col. Grot-Rowecki.*
Each company had 16 tanks, in three platoons. Mostly single-turret tanks were used, but they were supplemented by twin-turret ones (in WBP-M at least, it is not clear, if they were present in the 10th Cavalry Brigade).*
Both companies were intensively used in fighting: the 121st Company, among others, in Beskid mountains and Kolbuszowa, the 12th Company at Tomaszow Lubelski.*
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_____________[description by PIBWL]*