While people come up with post-hoc justifications for Wars all the time that relates to philosophical ideas, most of the time it is originally waged purly for economic reasons.

The French monarchy and the Russian Tsars were failing to feed their people so those people fought back. The philosophical ideas that the preceding leaders had about how to better distribute the food after the fact is another discussion, but make no mistake, the war was waged simply to get people fed by any means. There was by no means a uniformity of of thought among revolutionaries, but the victor writes history and creates a new myth to establish the following Society upon.

Something something material conditions.