In
Genghis Khan's military system, a tumen was recursively built from units of 10 (
aravt), 100 (
zuut) and 1000 (
mingghan), each with a leader reporting to the next higher level. Tumens were considered a practical size, neither too small for an effective campaign nor too big for efficient transport and supply. The military strategy was based on using tumens as a useful building block for shock assaults. A Mongol army usually consisted of three tumen, but
armies consisting of only one tumen were also deployed. Regardless, tumen would often be understrength and the number of tumen deployed doesn't provide an accurate number of combatants. The commander of a tumen was a
tümen-ü noyan, a term sometimes translated as "myriarch" (cf.
myriad), meaning commander of 10,000. == In modern armies ==