The aim of this paper is to theorize insurgent political action on the basis of Jean-Paul Sartre’s Critique of Dialectical Reason. It reconstructs a Sartrean model of insurgency that prioritizes an insurgent group’s capacity for situated inventions. It argues that, similar to Fanon, Sartre theorized that groups that struggle against oppression and exploitation constantly invent novel conditions that steer society in unforeseeable directions. However, these inventions of insurgent action are never absolutely contingent but always take place in concrete situations which (...) never cease to condition them. This paper analyses two concrete factors which condition the inventions of insurgent action: the seriality from which the group arises and to which it always threatens to return, and the actions of hostile groups. Taken together, this paper claims that Sartre provides a coherent and innovative account of insurgent political action. (shrink)