1. 70 cities
He and his Huns went on to sack more than 70 cities in the Balkans and penetrated deep into Greece, but were stopped at Thermopylae, leading to yet another peace treaty negotiation with harsh penalties for the Romans.
2. 40 million people
Estimates from Alliance 8.7. In 2017, a coalition of states and non-government organizations estimated that there were some 40 million people enslaved worldwide, as well as 152 million child laborers.
