NonCredibleDefense

Media's a relatively recent tool. If you mean proper, national-scale wars, very few were set in motion by regular people. Before the era of the nation-state, most wars were over dynastic or feudal disputes, or else naked imperialism. Wars set in motion by regular people would've been more like clan feuds and the like, which, while often vicious, are generally not large enough to be historically noteworthy. Some religious rebellions and the like would've been started primarily by ordinary people, like the Hussite Wars. Mass migrations and border feuds that steadily become larger in scale would count too, probably.