Explanation:

Kol Rebellion
•    The Kols and other tribes enjoyed autonomy under their chiefs but the entry of the British threatened their independence.
•    The transfer of tribal lands and the coming of moneylenders, merchants and British laws created a lot of tension. The Mahajans extracted 70 per cent or more interest and many Kols became boded labourers for life.
•    The Chhota Nagpur region was leased out to money-lenders for revenue collection. Their oppressive tactics, high revenue rates, British judicial and revenue policies devastated the traditional social framework of the Kols.
•    The trouble increased with large-scale transfers of land from Kol headmen (Mundas) to outsiders like Sikh and Muslim farmers.
•    These factors prompted the Kol tribe to organise themselves and rebel. The Kol tribals organized an insurrection in 1831-32 which was directed mainly against Government officers and private money-lenders. Other tribes also followed the same.The rebellion soon spread over a considerable area, including Ranchi, Hazaribagh, Palamau and Manbhum.
•    The insurgents adopted most cruel means and spared no one. They torched houses and killed the enemies (mainly outsiders). Only carpenters and blacksmiths were spared since they made weapons and other useful goods for them. After two years of intense resistance they lost to modern weapons of the British. Thousands of tribal men, women and children were killed and the rebellion was suppressed.
•    The immensity of the Kol rebellion could he gauged from the fact that troops had to be rushed from far off places like Calcutta, Danapur and Benaras to quell it.
Santhal rebellion
The Santhal rebellion predates 1857. It was a rebellion of Santhal people led by 4 Murmu Brothers named Sindhu, Kanhu , Chand and Bhairav, in modern Jharkhand (then Bengal Presidency) against the oppressive Zamindari system. The initially launched Guerilla warfare in the Jungles of Jharkhand. The British trapped these outstanding archers and killed them in a battle. The Santhal villages were plundered and the rebellion was brutally subdued.

Bhil Uprising
The Bhils were mostly concentrated in the hill ranges of Khandesh. The British occupation of Khandesh in 1818 enraged the Bhils because they were suspicious of outsiders’ incursion into their territory.
Moreover, it was believed that Trimbakji, rebel minister of Bari Rao II , instigated the Bhils against the British occupation of Khandesh.
There was a general insurrection in 1819 and the Bhils in several small groups ravaged the plains. There were similar types of insurrection quite often by the Bhil chiefs against the British. The British government used its military force to suppress the rebels and at the same time tried to win them over through various conciliatory measures. But the British measures failed to bring the Bhils to their side.