Babi law called for the destruction of the shrines and holy places of previous religions and, the universal slaughter of all save those who believed and were faithful...

In the 1840s and 1850s a series of violent incidents involving members of the Babi sect (see babism) and Shiʿites took place in Iran, the most serious of which were four military encounters at Shaikh Ṭabarsī in Māzandarān, Zanjān, and Neyrīz (twice). At the inception of the Babi movement in 1260/1844, an uprising (ḵorūj) against unbelievers was keenly anticipated; it was at first believed that this event would begin in 1261/1845 in Karbalāʾ, when the Hidden Imam would appear to lead the jehād in person. The Bāb’s earliest major work, the Qayyūm al-asmāʾ, contains detailed regulations governing the conduct of jehād (Qayyūm al-asmāʾ, sūras 96-101; see MacEoin, “Holy War,” pp. 101-09). Up to 1264/1848, the sect’s jehād doctrine was essentially that of orthodox Shiʿism, but after that date, with the Bāb’s assumption of the role of Mahdī, a new legal system was promulgated in the Persian Bayān and other works. It appears that the entire Shiʿite population of Iran was now regarded as subject to jehād: non-Babis were to be forbidden to live in any of the five central provinces of Fārs, Iraq, Azerbaijan, Khorasan, and Māzandarān. More broadly, Babi law called for the destruction of the shrines and holy places of previous religions and, as one later Bahai source puts it, “the universal slaughter of all save those who believed and were faithful” (ʿAbbās Effendi, Makātīb ʿAbd-al-Bahāʾ II, Cairo, 1330/1912, p. 266).

Several sources indicate that Babis in different centers were collecting and manufacturing arms in readiness for the postponed ḵorūj on the imam’s appearance (ibid., pp. 111-12; Māzandarānī, Ẓohūr al-ḥaqq, p. 374). The first serious incidents occurred in 1264/1848 in Mašhad, where armed members of the large Babi community clashed on two occasions with local soldiery. Expelled from Mašhad in Šaʿbān, 1264/July, 1848, a party of Babis under the leadership of Mollā Moḥammad-Ḥosayn Bošrūʾī headed into Māzandarān and in October of that year established themselves near Bārforūšī at the shrine of Shaikh Abū ʿAlī al-Fażl Ṭabarsī, which they fortified. From an original total of about 300, the number of insurgents rose to between 540 and 600 (Momen, “Social Basis,” pp. 161-65, esp. table 4). Leadership of the fort was in the hands of Bošrūʾī and another of the Bāb’s original disciples, Mollā Moḥammad-ʿAlī Bārforūšī Qoddūs. Between 14 Ḏu’l-qaʿda 1264/13 October 1848 and 16 Jomādā II 1265/9 May 1849, the Babi defenders and state troops under the overall command of Mahdīqolī Mīrzā engaged in sporadic fighting, with heavy losses of life on both sides. The siege was finally ended by a ruse and the surviving Babis either executed or taken prisoner.

http://www.iranicaonline.org/articles/babism-index