Passage: The slightly larger Thai Army was a relatively well-equipped force. Consisting of 60,000 men, it was made up of four armies. The largest were the Burapha Army with five divisions and the Isan Army with three divisions. Independent formations under direct control of the army high command included two motorised cavalry battalions, one artillery battalion, one signals battalion, one engineer battalion, and one armoured regiment. The artillery was a mixture of Krupp guns and modern Bofors guns and Howitzers, while 60 Carden Loyd tankettes and 30 Vickers 6-ton tanks made up the bulk of the army's tank force.

Question: Who controlled the independent formations?
army high command