Through the use of archives and legal texts, the author describes the trans
formation of modes of administration of justice in cases of common assault.
What makes this transformation significant is not only the gradual exclusi
on of justices of the peace from urban penal justice, but also a restructur
ing of the relationship between judiciary and infrajudiciary practices for
such conflicts. Inspired by the principle of certainty of punishment, legis
lative reform facilitated the prosecution of these conflicts. One of the im
plications of this, was that assaults were increasingly constructed as a pu
blic matter rather than a private issue.