Excavation of Patliputra at Kumhrar, carried out by Spooner, 3 coins of Wima Kadphises, 12 coins of Kanishka and 30 coins of Huvishka were discovered. At vaishali also quite a fairly large number of Kushana coins have been discovered copper coins were quite common in Bihar not only down to the end of the reign of Huvishka but even for about 50 years more. Copper coins do not travel long. Kushana copper coins are not known to have travelled to Central or Western India through trade. If, therefore, they are found to be fairly numerous at Vaishali and Patliputra, and if a hoard, almost exclusively consisting of them, is found in Buxar- consisting of coins extremely worn out, the conclusion seems to be irresistible that Magadha was conquered by the Kushanas early in their dynasic history.