This certainly puts things into perspective. Especially considering what happened to the Yuezhi, and their own confederation, when the HsiongNu or XiongNu (which are considered to be the forefathers of Attila's Huns) united under Modu and drove Yuehzi away from the Taklamakan plateau and their other residence. HsiongNu tribes were famously divided and always fighting each other when not pestering then Northern borders of the Han. Lack of food for their cattle is a great reason to unite if there is one, and then, united drive away all their potential enemies and create the first Khaganate.
http://en.wikipedia.org/wiki/Yuezhi
Then in a domino effect, Yuehzi invaded and conquered Saka land (the Sai as the Chinese call them), the Sakas then fell upon Baktria. They mustn't have fared that well initially, or they could have headed into India via a different path (that circumvented Baktrian territory). Then in approx. 155 BCE, the neighburing Wusun and a few Sakas that remained in their ancestral lands allied with the HsiongNu and drove the Yuehzi away into Baktria. This time, facing 200.000 twice refugees and absolutely desperate HA's Baktria fell, as documented by the destruction of one of its greatest cities and possible Eastern capital, Alexandreia Oxeiane (now known as Ai Khanoum) approximately at 145 BCE.
http://en.wikipedia.org/wiki/Alexandria_on_the_Oxus
Then they became known as Kushana Shahanshahs or "BasileisBasileon" in the greek coins they minted, creating an empire which lasted for 3 centuries and is famous to this day for its Buddhist monuments, and Buddhist missionaries who helped spread Buddhism in present day China.
http://www.flickr.com/search/?q=Gandhara
It goes without saying that we will never know for certain what exactly did happen. The reason why the HsiongNu united was always intruiging though. That volcano is a factor that has to be included in the debate why HsiongNu united, setting in motion all the events that followed. Another reason seemed to be the valiant defense of China that the Han organised. No longer facing small kingdoms which could be subdued with the help of their neighbours, HsiongNu had to unite to be able to claim some spoils from Han China. Once they did unite, besides Han China, weaker tribes around them were the obvious target, with the Yuezhi (Greek name Tokharoi) being on the top of that list .
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