Addendum: What were the tank types used by the Central Army in Hunan?
“The T-26 was a Soviet development of the British Vickers 6-Ton (Vickers Mk.E) (the Polish 7TP tank was another development of Vickers E 6-Ton) tank, which was designed by the Vickers-Armstrongs company in 1928–29. The simple and easy-to-maintain Vickers 6-Ton was intended for export to less technically advanced countries: the Soviet Union, Poland, Brazil, Argentina, Japan, Thailand, China, and many others. Vickers advertised the tank in military publications, and both the Soviet Union and Poland expressed interest in the Vickers design. In early 1930, the Soviet buying committee, under the direction of Semyon Ginzburg, arrived in Great Britain to select tanks, tractors, and cars for use in the Red Army. The Vickers 6-Ton was among four models of tanks selected by Soviet representatives during their visit to Vickers-Armstrongs. Under the contract signed on 28 May 1930, the company delivered to the USSR 15 twin-turreted Vickers Mk.E (Type A, armed with two .303 calibre (7.71 mm) water-cooled Vickers machine guns) tanks together with full technical documentation to enable series production of the tank in the USSR. The ability of the two turrets of the Type A to turn independently made it possible to fire to both the left and right at once, which was considered advantageous for breakthroughs of field entrenchments. Several Soviet engineers participated in assembly of the tanks at the Vickers Factory in 1930.”
It was already obsolete on the eve of German attack in 1941, and was soon replaced by the Soviet designed T-34 (1934).
It thus falls in the category of surplus exports from WWI industry. In any case, it was importable into China only until 1937…apparently from the USSR which produced it under license in Leningrad and in the famous Stalingrad Tractor Factory.
Probably no more that 20 or so made it.