Through this study, the researcher seeks to shed light on the phenomenon of war in the Middle Maghreb during the Zayyani era, this is by monitoring the long-term sieges, those imposed by the Marinid authority on the capital of Beni Zayyan, Tilimsan aiming to subject it to its influence during the period (689-737AH./1290-1337BC) so that we can unveil the remnants behind that massive conflict marked the Marinid- Zayyanids' relationship, where people of Tilimsan suffered severely from conflict by crystallizing the reality of these sieges, their causes, their courses and events, then the tricks adopted to break into with a view of its size and the scenes of turmoil, murder, displacement and destruction that it left behind, in addition to multiple crises and problems that these conflicts resulted within the society. This study began with mentioning meanings and connotations of war and siege linguistically and idiomatically, Then it touched upon the causes leading to war and conflict between Marinids and Zayyanids, then the researcher dealt with the sieges that Tilimsan was subjected to by Marinids with a view to subjugating, followed by handling the repercussions of the Marinids' sieges on the demographic composition of Tilimsan with their severe and critical damage left on economy where Tilimsans suffered for many years because during that era, the demographic collapse that Tilimsan perceived had been enough to disrupt all aspects and areas of their economy. Then I discussed the negative repercussions that had been left behind those sieges on social structure, as this was implemented by tracing the effects resulted from sieges affected the Moroccan family in general, and Tilimsani family in particular, by studying the impacts of the recurrence of news regarding wars as well as their impact on family, in addition to studying the impact of siege battles on a woman and a child, then handling their impact on the emergence of a segment of prisoners of war, followed by discussing the extension of the negative impact of the sieges on urbanization and facilities with their repercussions on scholars and jurists, and finally the conclusion, including the most important results of the study.