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Bihar

The rebellion in Bihar was mainly concentrated in the Western regions of the state; however, there were also some outbreaks of plundering and looting in Gaya district. One of the central figures was Kunwar Singh, the 80-year-old Rajput Zamindar of Jagdishpur, whose estate was in the process of being sequestrated by the Revenue Board, instigated and assumed the leadership of revolt in Bihar. His efforts were supported by his brother Babu Amar Singh and his commander-in-chief Hare Krishna Singh.

On 25 July, mutiny erupted in the garrisons of Danapur. Mutinying sepoys from the 7th, 8th and 40th regiments of Bengal Native Infantry quickly moved towards the city of Arrah and were joined by Kunwar Singh and his men. Mr. Boyle, a British railway engineer in Arrah, had already prepared an outbuilding on his property for defence against such attacks. As the rebels approached Arrah, all British residents took refuge at Mr. Boyle's house. A siege soon ensued – eighteen civilians and 50 loyal sepoys from the Bengal Military Police Battalion under the command of Herwald Wake, the local magistrate, defended the house against artillery and musketry fire from an estimated 2000 to 3000 mutineers and rebels.

On 29 July 400 men were sent out from Danapur to relieve Arrah, but this force was ambushed by the rebels around a mile away from the siege house, severely defeated, and driven back. On 30 July, Major Vincent Eyre, who was going up the river with his troops and guns, reached Buxar and heard about the siege. He immediately disembarked his guns and troops (the 5th Fusiliers) and started marching towards Arrah, disregarding direct orders not to do so. On 2 August, some 6 miles (9.7 km) short of Arrah, the Major was ambushed by the mutineers and rebels. After an intense fight, the 5th Fusiliers charged and stormed the rebel positions successfully. On 3 August, Major Eyre and his men reached the siege house and successfully ended the siege.

After receiving reinforcements, Major Eyre pursued Kunwar Singh to his palace in Jagdispur; however, Singh had left by the time Eyre's forces arrived. Eyre then proceeded to destroy the palace and the homes of Singh's brothers.

In addition to Kunwar Singh's efforts, there were also rebellions carried out by Hussain Baksh Khan, Ghulam Ali Khan and Fateh Singh among others in Gaya, Nawada and Jehanabad districts.

In Barkagarh Estate of South Bihar (now in Jharkhand), a major rebellion was led by Thakur Vishwanath Shahdeo who was part of the Nagavanshi dynasty. He was motivated by disputes he had with the Christian Kol tribals who had been grabbing his land and were implicitly supported by the British authorities. The rebels in South Bihar asked him to lead them and he readily accepted this offer. He organised a Mukti Vahini (Liberation Regiment) with the assistance of nearby zamindars including Pandey Ganpat Rai and Nadir Ali Khan.