June 24, 1939
(JAAF) Ki-15 reconnaissance flight by Lt. Col. Mayoshi of the 10th Sentai over Tamsagbulag. Observed are 135 aircraft including 4 TB-3 heavy bombers.
June 27, 1939
(JAAF) At dawn, a force of bombers led by Lt. General Giga takes off from Hailar Airfield including: 9 x Ki-30 of the 10th & 16th Sentai,
9 x Ki-21of the 61st Sentai plus 12 x BR.20 of the 12th Sentai. From forward airfields they are escorted by 74 x Ki-27 from the 24th Sentai flying top cover. On the ground at Tamsag, Soviet forces were surprised by the arrival of the enemy aircraft and I-15 and I-16s were scrambled to intercept, and a massive dogfight involving over 150 planes unfolds. Soviets lost three I-15s.
August 21, 1939
(JAAF) In the morning, six Ki-30 of the 10th Sentai dive bomb SB bombers parked at Tamsagbulag Airfield, claiming two destroyed and meet no resistance in the air, only anti-aircraft fire. A Ki-36 makes
a reconnaissance flight over the area for the planned afternoon raid.
In the early afternoon, 24 x Ki-30 from 10th Sentai plus 12 x Ki-21 from 61st Sentai and 15 x Ki-36 from 15th Sentai escorted by 88 x Ki-27s from the 1st Sentai, 11th Sentai and 64th Sentai attack. The Ki-30s attack the northern runway at Tamsag, but find few targets and attack a vehicle column instead. 15th Sentai attacks the southern runway and attacks SB bombers on the ground. Intercepted by I-16 and I-153s, that loose three I-16s and three I-153s in the dogfight.
September 12, 1939
(JAAF) Reconnaissance flight over Tamsagbulag and Buir Nur observes 16 twin engined aircraft and 68 fighters on the ground.
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