Pamphlet wars were waged on topics other than politics. In the 1750s in Paris a great pamphlet war was waged contrasting the virtues of French opera against Italian opera. It was called La Querelle des Bouffons or the "Quarrel of the Comedians". Rousseau was engaged in this pamphlet war because his interests encompassed both music and politics.
BBC link on the Quarrel of the Comedians