The relative lightness of the following regime's violence is also remarkable. Out of a population of 95 million in 1970 official institutions caused 400+ political deaths, of which a large part were in violent organizations, with that number including the Araguaia guerrila war's casualties. Political violence went both ways and outside that number are 100+ killed by the other side. In relative and absolute terms that's a lot less bloody than the Argentine or Chilean regimes which on smaller populations had tens of thousands of deaths.

I'm finding more sources on the 1930 Revolution which I'll study after this. It had urban combat with a lot of civilian casualties and proper field battles with trenches and brutal artillery bombardments.