During 1939-40, Subhas Chandra Bose formed an alliance with the Muslim League to destroy the Holwell Monument in Calcutta. The Holwell Monument was a memorial erected in memory of John Zephaniah Holwell, an East India Company official who was the survivor of the Black Hole of Calcutta incident in 1756. This incident occurred during the period of British colonization in India when a number of British prisoners were held captive in a small room known as the Black Hole, resulting in the death of many due to suffocation.

Subhas Chandra Bose, a prominent Indian nationalist leader, aimed to perpetrate acts of sabotage against symbols of British imperialism in India. To achieve this, he sought alliances with various political groups. In this particular case, he aligned with the Muslim League, a political party that advocated for the rights and interests of the Muslim community in India. By joining forces, Bose and the Muslim League aimed to collectively oppose British rule and eliminate the Holwell Monument.

It should be noted that this alliance was a part of Bose`s broader efforts to mobilize different religious and ideological groups in India towards a united front against British colonialism.