33 Meanwhile the principal desire which filled these new preachers of penance was to help bring back peace not only to individuals but to families, cities, and even nations, torn by interminable wars and steeped in blood. If at Assisi, Arezzo, Bologna, and in many other cities and towns it was possible to bring about a general era of peace, at times confirmed even by solemn treaties, this was due altogether to the superhuman power of the eloquence of these rough men.
Source: Rite Expiatis (Vatican.va)