On June 23, 1757, a gloomy morning saw a conflict take place north of the village of Plassey (also known as Palashi), on the Hughli (Hooghly) river's bank, some 150 kilometers (93 mi) north of Calcutta (now Kolkata) and south of Murshidabad in West Bengal, the country's then-capital of Bengal Subah (now in Nadia district in West Bengal). Both Clive's army, which consisted of over 50,000 soldiers, and Nawab's army, which included 10 war elephants and more than 50 guns, were divided into three divisions. Mir Jafar Ali Khan was the commander of one division. A lightning strike at noon signaled the beginning of a severe shower of rain that lasted 30 minutes after an introductory cannonade.
When it started to rain, the conflict seemed to be reaching a deadlock. The Bengalis lacked the tarpaulins that Clive had brought to keep their powder dry. Siraj gave Mir Jafar the order to cover their explosives. But he ignored to do the same and their artillery was rendered unusable. Therefore, the Nawab ordered his cavalry to charge and was met with a withering rain of fire as his force advanced, assuming that Clive's guns had also been rendered inoperable as his own by damp powder.
At 2 pm on that day, the cavalry's commander, Mir Madan Khan, was mortally wounded by a British cannonball and died. Many of the other fighters and officers like Diwan Mohanla, Nawe Singh Hajari, and Bahadur Khan were also killed when the British guns opened fire and massacred a large number of them. The Nawab ordered his forces to retreat after learning of the death of this beloved general, which left the French artillery unit exposed. The British rushed in and took control of it. The British bombarded the nawab's positions without receiving a response after capturing the French cannon, which caused the battle's momentum to change. When Mir Jafar Ali Khan suggested retreating, Siraj lost his cool. He distrusted his generals, and his astrologer had already warned him of impending doom (who had probably been bribed off).
As Siraj rode off the battlefield on a swift camel, Clive's soldiers launched yet another assault. Mir Jafar, a puppet of the British, was duly put in charge. When the British arrived at the enemy camp later that afternoon, around 5 o'clock, it was deserted. His discouraged soldiers had done likewise. Only twenty-two British soldiers died in the battle, but it marked a significant step closer to British control of Bengal.
The Nawab managed to flee to Murshidabad before traveling by boat to Patna, where he was ultimately seized by Mir Jafar's men. Mohammad Ali Beg killed Siraj-Ud-Daulah on July 2, 1757, at the direction of Mir Jafar, the puppet king the British had placed. His name became the Bengali word for "traitor."
The conflict aided in Bengal's capture by the British East India Company. They acquired control of the majority of the remaining Indian subcontinent, Burma, and Afghanistan during the following 100 years. The Company was permitted to conduct business tax-free throughout Bengal, Bihar, and Orissa once Mir Jafar Ali Khan was formally recognized as the Nawab of Bengal per the agreement (Odisha). Additionally, the 24 Parganas zamindari near Calcutta was given to the company. As compensation for the siege on Calcutta, Mir Jafar also granted the firm one crore seventy-seven lakh rupees. The British traders in the city also received restitution. He also offered enough money as a bribe to the Company's representatives.