Page:Political History of Parthia.pdf/102

56 Yüeh-chi occupied the lands of the Sak and forced the Sak to move westward before them into Bactria. The Sacae, by this time a large horde consisting partly of Sacaraucae and Massagetae and partly of other smaller groups gathered en route, were thus forced into Ta-hsia (Bactria).

Determination of the time when this migration came into conflict with the Parthians depends upon the uncertain date of the Parthian expansion to the east. While the Parthian invasion of India under Mithradates I (171–138 ) can hardly be styled a "legend," there is no good evidence as yet for such conquests beyond the statement of Orosius, a late writer of uncertain accuracy. If by Hydaspes he