In recent decades, conflict archaeology has renewed study of the Roman Republican military, with Hispania as one of the most prolific areas of research. Following this trend, since 2006 the University of Barcelona has conducted archaeological investigations at several sites in the lower Ebro basin. When no structures or archaeological layers remained in situ, surface survey became a key methodology. Based on the artifacts retrieved during surface survey, this article identifies four new military establishments dated to the first half of the 1st c. BCE and reinterprets the campaigns of the Sertorian War in northeastern Spain.