Sachindra Nath Sanyal established a branch of Anushilan Samiti at Patna in 1913.

Explanation:
The Anushilan Samiti was a revolutionary organization in Bengal, India, during the early 20th century. It was established with the aim of overthrowing British colonial rule and achieving independence for India. The organization was founded by Pramatha Mitra, a schoolteacher from Medinipur, and his associates in 1902.

Sachindra Nath Sanyal, a prominent leader of the Anushilan Samiti, played a significant role in expanding the organization's reach beyond Bengal. He was born in 1893 in Dacca (now Dhaka) and was deeply influenced by the nationalist fervor of the time. Sanyal joined the Anushilan Samiti and quickly rose through the ranks due to his dedication and leadership skills.

In 1913, Sanyal established a branch of the Anushilan Samiti in Patna, Bihar. This expansion was part of the organization's strategy to spread its revolutionary activities to other parts of India. The Patna branch became a center for revolutionary activities in Bihar and played a vital role in mobilizing support and organizing protests against British rule.

Under Sanyal's leadership, the Anushilan Samiti in Patna carried out various revolutionary activities, including acts of violence against British officials, distribution of nationalist literature, and organizing secret meetings to discuss revolutionary strategies. Sanyal also actively recruited and trained new members, instilling in them a sense of patriotism and commitment to the cause of independence.

The establishment of the Patna branch of the Anushilan Samiti by Sanyal further strengthened the organization's presence in Bihar and provided a platform for revolutionary activities in the region. It contributed to the growth of the nationalist movement and played a crucial role in shaping the course of India's struggle for freedom.

In conclusion, Sachindra Nath Sanyal established a branch of the Anushilan Samiti at Patna in 1913, expanding the organization's reach beyond Bengal and contributing to the revolutionary activities against British colonial rule in Bihar.