By the autumn of 1848, four years after the Bab's declaration in Shiraz, his followers across Iran faced mounting mob violence and state hostility serious enough that a substantial group, several hundred strong and led by Mulla Husayn, the Bab's own first disciple, made the decision to gather at a rural shrine tomb in the forests of Mazandaran province rather than continue to face scattered, unorganized persecution. The site took its name from Shaykh Tabarsi, a local holy man buried there, and the Babis fortified the tomb complex with earthworks and defensive walls, transforming a modest place of local pilgrimage into something closer to a besieged garrison.
What followed was not a single battle but a sustained siege stretching across roughly seven months, through the winter and into the spring of 1849, during which government troops and local forces mounted repeated assaults against a numerically much smaller defending force. Mulla Husayn was killed by gunfire partway through the siege, and command passed to Quddus, another senior Babi figure, whose leadership held the defense together for months afterward. The stand at Tabarsi is, among early Babi episodes, the clearest example of the movement organizing an armed, sustained collective defense rather than facing persecution as scattered individuals, and it shaped how both hostile authorities and the Babis themselves understood the conflict that was by then already underway.