Filaria haemorrhagica) is a parasitic nematode of the genus Parafilaria,[1] which affects horses causing hemorrhagic subcutaneous nodules in the head and upper forelimbs, in North Africa, Southern and Eastern Europe, Asia and South America, leading to bleeding from the skin.

[2] '“Modern researchers, [Professor Victor] Mair notes, have come up with two different ideas [for the ancient Chinese references to the “Blood-sweating” horses of Ferghana].

After a gruesome march of over 1,000 miles he finally arrived to the country of Dayuan, but what remained of his army was exhausted and starving.

After a severe defeat at a place called Yucheng, Li concluded that he was not strong enough to take the enemy capital and therefore returned to Dunhuang about 102 BC.

Emperor Wudi responded by giving Li Guangli a much larger army along with a huge number of oxen, donkeys and camels to carry supplies.

He lost half his army during the march,[1] but after a 40-day siege the Chinese had broken through the outer wall and cut off the water supply.