In 1835–1836, Colonel Pullo, chief of the Sunzha fortified line, conducted systematic expeditions against Chechen villages that supported Imam Tashu-Hajji. The imperial review of military operations acknowledges: Tashu-Hajji’s attempts "were preempted in good time by the expeditions of the chief of the Sunzha line, Col. Pullo, which inflicted utter ruin on the residents"[1]. On August 23, 1836, Pullo led a detachment by a covert night march to the aul of Zandak on the Yaman-su River. Corps commander Rosen reported to the Minister of War on the objective: "in order to shake the influence of Tashev-Hajji and to quell the unrest among the Chechens and instill fear in them, I resolved to undertake movements to punish the residents of the village of Zandak"[1].