When Genghis Khan attempts the conquest of the world (1209), the Mongol population numbers between 400 000 and 600 000 inhabitants, among which 200 000 are warriors. Together, all the countries targeted for conquest can muster a global population of more than 200 millions inhabitants (which is then 400 times the total number of inhabitants in Mongolia). The Mongols are a tiny minority and their army is almost always outnumbered when facing the various enemies on countless battlefields.
The fact that their enemies are much more numerous triggers an inferiority complex among the Mongols, and the panic fear that their armies may be drowned some day in the multitude of the conquered populations. The only solution to make these conquered populations less dangerous, would be to decrease their numbers; and the only way to achieve that would be to massacre an important part of each of them.
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If one asks: why all those massacres?, the only answer that comes to mind is military necessity. The coming of the Mongol horsemen was generally not followed by rebellion (except in the Khwarezm and especially the Khorassan), because the revolts were crushed beforehand by a terror without precedent. Such massacres, when 98% of the population of certain regions is exterminated, leave a lasting impression. When only 2% of the population is left alive, terror works and the survivors have no inclination to revolt anymore.
Furthermore, during a military campaign, depopulation is sometimes the most convenient means of securing the rear. There is no need to leave behind an occupation army in a depopulated land. The great novelty is to be able to control a territory without ever having to occupy it.
Partisan war against the occupier is impossible. You cannot harass the occupier, then there is no occupation. This kind of remote control (the Mongol armies are stationed far away from the rare conquered cities that have been left intact) renders all modern techniques of urban guerrilla warfare or jungle warfare completely inefficient against the Mongols.
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