By the 1850s, Maniram had become hostile to the British. He had faced numerous administrative obstacles in establishing private tea plantations, due to opposition from the competing European tea planters. In 1851, captain Charles Holroyd, the chief officer of Sibsagar seized all the facilities provided to him due to a tea garden dispute. Maniram, whose family consisted of 185 people, had to face economic hardship. He wrote that the people of Assam had been "reduced to the most abject and hopeless state of misery from the loss of their fame, honour, rank,
caste, employment etc." He pointed out that the British policies were aimed at recovering the expenses incurred in conquering the Assam province from the Burmese, resulting in exploitation of the local economy. He protested against the waste of money on frivolous court cases, the unjust taxation system, the unfair pension system and the introduction of
opium cultivation. He also criticized the discontinuation of the
puja (Hindu worship) at the
Kamakhya Temple, which according to him resulted in calamities. Maniram further wrote that the "objectionable treatment" of the Hill Tribes (such as the
Nagas) was resulting in constant warfare leading to mutual loss of life and money. He complained against the desecration of the Ahom royal tombs and looting of wealth from these relics. He also disapproved of the appointment of the
Marwaris and the
Bengalis as
Mouzadars (a civil service post), when a number of Assamese people remained unemployed. He also remarked that Maniram was "a clever but an untrustworthy and intriguing person". To gather support for the reintroduction of the Ahom rule, Maniram arrived in
Calcutta, the then capital of British India, in April 1857, and networked with several influential people. On behalf of the Ahom royal
Kandarpeswar Singha, he petitioned the British administrators for restoration of the Ahom rule on 6 May 1857. When the Indian
sepoys
started an uprising against the British on 10 May, Maniram saw it as an opportunity to restore the Ahom rule. With help from messengers disguised as
fakirs, he sent coded letters to
Piyali Baruah, who had been acting as the chief advisor of Kandarpeswar in his absence. In these letters, he urged
Kandarpeswar Singha to launch a rebellion against the British, with help from the sepoys at
Dibrugarh and
Golaghat. Kandarpeswar and his loyal men hatched an anti-British plot and gathered arms. The plot was supported by several influential local leaders including
Urbidhar Barua,
Mayaram Barbora,
Chitrasen Barbora,
Kamala Charingia Barua,
Mahidhar Sarma Muktear,
Luki Senchowa Barua,
Ugrasen Marangikhowa Gohain,
Deoram Dihingia Barua,
Dutiram Barua,
Bahadur Gaon Burha,
Sheikh Formud Ali and
Madhuram Koch. The conspirators were joined by the
Subedars
Sheikh Bhikun and
Nur Mahammad, after Kandarpeswar promised to double the salary of the sepoys if they succeeded in defeating the British. Maniram's death was widely mourned in Assam, and several tea garden workers struck work to express their support for the rebellion. The executions led to resentment among the public, resulting in an open rebellion which was suppressed forcefully. == Legacy ==