Mandi Conspiracy :
1. It was beginning of disintegration of Sikh powers in the hills and British power emerged as most powerful. In 1849, Princely states of Mandi, Suket and Chamba were put under the control of Superintendent 'Cis-Satluj States'. Lala Lajpat Rai visited Mandi during 1906 to organize the revolutionary activities.
2. Revolt occurred in Mandi State against the repressive, corrupt and arrogant administration of Raja Bhawani Sen and his Wazir Jiwa Nand Paddha. This revolt was led by Shobha Ram in 1909.
3. A Prominent revolutionary of Mandi, Hardev Ram joined revolutionary band of patriots in 1913. He went to Shanghai, America and Japan where he met Lala Hardayal and Dr. Mathura Singh.
4. Another revolutionary of Mandi Bhai Hirda Ram started participating in revolutionary activities in 1914. He joined Ras Behari Bose,Sant Baba Wasakha Singh Dadehar, Mathura Singh, Kartar Singh Sarba, Bhai Parma Nand and Pingle.
5. The Mandi conspiracy was carried out in 1914-15 under the influence of the Gadhr party. Meetings were held in Mandi and Suket states in December 1914 and January 1915 and it was decided to murder the Superintendent and Wazir of Mandi and Suket, to loot the treasury, blow to up the bridge over Beas river. However conspirators were caught and sentenced to long terms in prison.
6. In 1915, on the request of Sarla Devi, wife of Bhai Hirda Ram, the Viceroy converted his death sentence into life imprisonment. In the same year, Nagchala Dacoity in Mandi state took place.
7. In Mandi conspiracy case, Mandi revolutionary Sidhu Kharara was sentenced for seven years in 1917.
8. After this, Mandi Legislative Council was constituted in 1933. Swami Purna Nand of Mandi was elected as president of "Himalayan Hill states regional Council" (founded in 1945) & Pt. Padam Dev became its general secretary.
9. The session of "Himalayan Hill states regional Council" was held at Mandi from 8 March 1946 to 10 March 1946. It was also attended by INA activists Dhillon, Sehgal and Shahnawaj. So finally, Mandi came into existence on 15 April 1948. Suraj Sen ruled over Mandi at time of Damdama Mahal of Mandi.