Hiten Patel, Buddist never disbanded the army. The Mauryans controlled their empire quite well and Asoka installed his stone pillars preaching peace across his empire. The invasion happened when the Sunga dynasty took over. Yes the Buddhist were Hindus before they became Buddhist yet the Brahmins hated them so, people from their own country refined their religion to make it more tolerant and scientific and these guys wanted to undo everything just like terrorists want to undo civilization and go back to the 7th century? You can see the behavior of the decendants of Pusyamitra Sunga even now. Go to Bihar and see who commits the majority crime. Not only white collor crime but perfectly blue collar violent crimes.