equipped with 15 T-26 and 15 T-38 tanks from the Belorussian Military District, and the 349th OTB, equipped with 12 T-26 and 19 T-37/T-38 tanks from the Training Regiment of the Leningrad Armour Technical School. The narrow terrain only allowed the use of two or three T-26 tanks in co-operation with a rifle company or battalion. Tanks of 411th OTB attached to the 52nd Rifle Division were used the most actively. The 349th OTB concentrated in Petsamo on 13 December 1940 where it joined the 104th Rifle Division. The 14th Army lost three tanks to artillery fire, two to landmines, and two drowned. At the Battle of Tolvajärvi and afterwards, the Finnish managed to capture or destroy nearly 12 T-26 tanks during the defeat of the 75th Rifle Division. At the battles of Suomussalmi and Raate, the Soviet 44th Rifle Division was encircled and lost all armour of its 312th OTB, including 14 T-26s. Altogether, the Finns would capture almost 70 T-26 tanks of different models, including KhT-26 and KhT-130 flame-throwing tanks, during the Winter War, a number equal to the entire pre-war Finnish armoured force. The combat and technical losses of the 7th Army in action on the Karelian Isthmus from 30 November 1939 to 13 March 1940 were 930 T-26 tanks of all variants, with 463 of these repaired during the war. All told, losses of T-26 tanks exceeded the number in inventory at the beginning of the war, but the number of T-26s at the front did not decrease due to reinforcements received from factory and tank workshops and new tank units arriving at the front. There were 1,331 T-26, BT and T-28 tanks at the Northwest Front in the beginning of February 1940, which increased to 1,740 tanks on 28 February 1940 when the breakthrough of the second Finnish line of defense began. For example, the 29th Light Tank Brigade (commander – brigade commander S. Krivoshein) with 256 T-26s was redeployed from Brest to the Karelian Isthmus in February 1940. The brigade played a key role in the assault of Vyborg on 12–13 March 1940. In the end, the Winter War proved that the T-26 was obsolete and its design reserve was totally depleted. Finnish anti-tank guns easily penetrated T-26's thin anti-bullet armour, and its cross-country ability in the rough terrain, covered with deep snow, was mediocre because of low-powered engine. It was decided to withdraw