Trần dynasty military tactics and organization
During the Mongol invasions of Vietnam the Trần dynasty (1225–1400) successful employed military tactics and strategies including scorched earth and hit and run tactics designed to take advantage of terrain. == Organization == The Royal Vietnamese army had a military force of up to 100,000 soldiers in 1281.
Source: Wikipedia — Trần dynasty military tactics and organization (CC BY-SA 4.0)