Background to the Battle of Buxar
After the Battle of Plassey in 1757, Mir Jafar was installed as the Nawab of Bengal with the full support of the British East India Company. However, the relationship soon began to deteriorate. The Company became increasingly demanding, and Mir Jafar found it difficult to meet their expectations, especially financial payments promised after the Plassey settlement. His inability to fulfil the financial obligations, coupled with the exhausted state treasury, created deep resentment among Company officials.
[Also Read about Battle of Plassey 1757 and Conquest of Bengal](https://learnpro.in/conquest-of-bengal-battle-of-plassey/)
At the same time, Mir Jafar’s administrative inefficiency and his growing disinterest in governance made him unpopular among the people of Bengal. The situation further complicated after the death of Miran, Mir Jafar’s son, leading to a succession dispute between Mir Kasim (his son-in-law) and Miran’s minor son.

Mir Qasim
Given the circumstances, the Company began to search for a more competent and pliable successor. Mir Kasim offered better financial assurances, which proved decisive. The Company chose to back his claim to the throne, especially under the leadership of Henry Vansittart, who became Governor of Bengal after Clive’s departure in 1760.
Treaty of 1760 and Mir Kasim's Accession
A formal treaty was signed in 1760 between Mir Kasim and the British East India Company. Its provisions reflected both political alignment and economic ambition:
- Mir Kasim would cede the districts of Burdwan, Midnapur, and Chittagong to the Company.
- The Company would receive half the revenue from the chunam (lime) trade in Sylhet.
- He agreed to pay all pending dues to the Company.
- A sum of ₹5 lakh was promised for Company war expenses in southern India.
- It was agreed that the Company’s friends and enemies would also be Kasim’s friends and enemies, showing an alliance-based understanding.
- Tenants from Nawab’s territory could not settle in Company lands, and vice versa.
Under pressure, Mir Jafar resigned, and a pension of ₹1,500 per annum was fixed for him. Thus, Mir Kasim became the Nawab of Bengal.
Mir Kasim's Reforms and Assertion of Autonomy
Mir Kasim, unlike his predecessor, had both administrative ability and political ambition. He was regarded as the most capable successor of Alivardi Khan. Refusing to be a puppet in the hands of the British, he made deliberate efforts to establish an independent and efficient administration.
Key Reforms by Mir Kasim:
- Shifting the capital from Murshidabad to Munger (Bihar), thereby physically distancing his seat of power from the British base at Calcutta.
- Reorganising the bureaucracy by appointing competent and loyal officials.
- Setting up factories for arms manufacture and strengthening the military infrastructure.
- Training the army on European lines, making it better prepared to resist any external intervention.
- Realising state arrears to replenish the empty treasury.
- Abolishing all internal duties to neutralise the British misuse of dastaks and provide equal opportunities to Indian traders.

Governor Vansittart
The abolition of internal duties was a direct challenge to British commercial dominance. While Indian merchants welcomed this step, the British strongly protested, demanding preferential trade privileges.
Despite repeated complaints from Governor Vansittart, Mir Kasim refused to reduce his military strength or reverse his policies. His assertion of autonomy, both economically and politically, increasingly frustrated the Company.
Escalation to Conflict
Mir Kasim’s reforms were aimed at building a sovereign and self-sufficient Bengal. However, these very measures—economic equality for native traders, independent military build-up, administrative centralisation—were seen by the Company as acts of defiance.
Ultimately, the British chose to retaliate. In 1763, they deposed Mir Kasim and reinstalled Mir Jafar, the compliant former Nawab. This decision pushed the conflict toward a full-scale military confrontation, setting the stage for the Battle of Buxar in 1764.
Causes of the Battle of Buxar
The roots of the Battle of Buxar can be traced directly to the aftermath of the Battle of Plassey (1757) and the appointment of Mir Kasim as Nawab of Bengal. Initially installed with the support of the British East India Company in 1760, Mir Kasim was expected to remain a compliant and cooperative ruler. However, once in power, he challenged British expectations and took a series of administrative, military, and economic steps that were seen as hostile by the Company.
Mir Kasim's Administrative and Financial Reforms
Mir Kasim initiated several reforms aimed at strengthening the financial and administrative backbone of his state. These included:
- Reduction in palace and administrative expenditure
- Manufacture of firelocks and guns
- Regular payment of salaries to officials and troops
- Imposition of new taxes
- Shifting the capital from Munger to Murshidabad
These actions disturbed the entrenched interests of the Company’s officers and provoked annoyance among British administrators in Bengal.
Abolition of Internal Taxes and Misuse of Dastaks
One of his most bold and controversial decisions was the abolition of internal taxes altogether. This step was taken in response to the rampant misuse of dastaks (free trade passes) by British officials, which allowed them to dominate trade while Indian merchants had to pay heavy duties. This move aimed to level the playing field between British and Indian traders, but it infuriated the Company, which was unwilling to surrender its commercial advantages.
Defiance of Ram Narayan
Another major flashpoint arose in Bihar. Ram Narayan, the deputy governor of Bihar, repeatedly refused to submit revenue accounts despite orders from Mir Kasim. This open defiance was encouraged by the English officials in Patna, particularly because Ram Narayan was viewed as a reliable ally by the Company.
Mir Kasim saw this as a direct challenge to his authority, and the already strained relationship between him and the British further deteriorated.
Initial Military Engagements (1763)
The conflict over transit duties eventually escalated into open warfare in 1763. Between June and September 1763, three battles were fought between the British and Mir Kasim’s forces. In all these encounters, the British emerged victorious, severely weakening Mir Kasim's position.
Following these defeats, Mir Kasim fled to Allahabad, seeking refuge and political support to counter the Company’s growing power.
Formation of the Triple Alliance
At Allahabad, Mir Kasim began diplomatic negotiations to form a broad alliance against the British. He approached two key figures:
- Shuja-ud-Daulah, the Nawab of Awadh (Oudh)
- Shah Alam II, the Mughal emperor

Shah Alam II
Shah Alam II, who had been in the eastern region since 1758, had fled the unstable and faction-ridden politics of Delhi when he was still a crown prince. He had hoped to carve out an independent power base in eastern India. After the assassination of his father Alamgir II in 1759, he declared himself emperor and appointed Shuja-ud-Daulah as his wazir.

Shuja-ud-Daulah
Although reluctant at first, both Shah Alam and Shuja eventually agreed to support Mir Kasim after prolonged and complex negotiations. Their participation in the conflict was secured through strategic promises:
- Shuja-ud-Daulah was promised the province of Bihar and its treasury, along with a payment of ₹30 million, on the condition of British defeat.
- The alliance aimed to reassert Mughal influence, contain the expansion of the British, and restore indigenous control over eastern India.
Thus, by late 1763 and early 1764, the stage was set for a major military confrontation between the British East India Company and a combined Indian front led by Mir Kasim, Shuja-ud-Daulah, and Shah Alam II—a conflict that would culminate in the Battle of Buxar in October 1764.
The Battle of Buxar (1764)
The Battle of Buxar was fought on 23 October 1764 at Katkauli, approximately 6 kilometers from Buxar, located then within the territory of Bengal. The confrontation took place between the British East India Company, led by Major Hector Munro, and the combined forces of:
- Mir Qasim, the deposed Nawab of Bengal
- Shuja-ud-Daulah, the Nawab of Awadh
- Shah Alam II, the Mughal Emperor

The battle was the culmination of a political and military struggle that had been intensifying since the British consolidated power after the Battle of Plassey. The alliance of the three Indian rulers was formed with the primary objective of curbing British influence in Bengal and reasserting indigenous sovereignty.

Objectives and Internal Divisions of the Alliance
After ascending to the Mughal throne, Shah Alam II aimed to revive the authority of the Mughal Empire by reclaiming control over key eastern territories, particularly Bengal, Bihar, and Orissa. These territories were historically under Mughal suzerainty but were now under the growing influence of the East India Company.
Shuja-ud-Daulah, who provided shelter to Shah Alam II, also sought to curb British supremacy in Bengal and saw in Mir Qasim and the emperor valuable allies. The primary cause of the conflict was the desire of these rulers to reclaim Bengal and reduce the Company’s power.
However, this tripartite alliance was plagued by internal divisions from the beginning:
- Shah Alam II and Shuja-ud-Daulah were often at odds, leading to political friction within the camp.
- Mir Qasim, having suffered successive defeats in 1763, was now reluctant and cautious in committing to full-scale battle.
- The lack of coordination, unified command, and shared military strategy
The Battle (October 22, 1764)
Despite these internal fissures, the allied forces, estimated to be around 40,000 to 50,000 men, eventually confronted the British East India Company's army, led by Major Hector Munro. The British force was significantly smaller, numbering approximately 7,000 to 8,000 men, but comprised well-trained European and Indian (sepoy) troops, along with superior artillery.
The battle took place at Buxar, a small town in present-day Bihar. The allied forces, despite their numerical superiority, suffered from a lack of cohesion and effective leadership. Mir Qasim's troops, though initially fighting bravely, were eventually overwhelmed. Shuja-ud-Daulah's contingent also failed to make a decisive impact, and Shah Alam II's forces were largely ineffective.
The battle was a decisive victory for the British. The allied forces suffered heavy casualties, estimated to be around 2,000 to 6,000 men, while the British lost only a few hundred. Mir Qasim fled the battlefield and later died in obscurity. Shah Alam II surrendered to the British, and Shuja-ud-Daulah also eventually sought terms.
Consequences and Significance
The Battle of Buxar was far more significant than the Battle of Plassey (1757) in terms of its long-term impact on British power in India. While Plassey had established the British as a dominant political force in Bengal, Buxar cemented their position as the paramount power in eastern India and laid the foundation for their eventual empire.
- Treaty of Allahabad (1765): Following the victory, Robert Clive, who had returned to India as Governor of Bengal, negotiated two separate treaties:
- With Shah Alam II: The Mughal Emperor granted the British East India Company the Diwani rights (right to collect revenue) of Bengal, Bihar, and Orissa. In return, the Company agreed to pay an annual tribute of 26 lakh rupees to the Emperor and ceded the districts of Kara and Allahabad to him. This effectively made the British the de facto rulers of these rich provinces, while the Mughal Emperor became a mere pensioner.
- With Shuja-ud-Daulah: The Nawab of Awadh was forced to pay a war indemnity of 50 lakh rupees to the Company. Awadh was returned to him, but he had to maintain a British resident at his court and allow the Company to trade duty-free. Awadh became a buffer state under British protection, strategically important for defending Bengal from Maratha incursions.
- Consolidation of British Power: The Diwani rights gave the Company direct control over the vast revenues of Bengal, Bihar, and Orissa, which were then used to finance its army, administration, and commercial activities. This eliminated the need to import bullion from Britain to purchase Indian goods, leading to a massive drain of wealth from India.
- End of Mughal Authority: The Mughal Emperor, by granting the Diwani, effectively surrendered his sovereignty over the richest provinces of his empire. He became a puppet ruler, dependent on the British for his sustenance and protection.
- Dual Government in Bengal (1765-1772): Robert Clive introduced a system where the Company held the Diwani (revenue collection) and the Nawab retained the Nizamat (administrative and judicial functions). This system led to immense corruption, exploitation of the peasantry, and administrative chaos, culminating in the devastating Bengal Famine of 1770.
- Military Supremacy: Buxar demonstrated the superior military organization, discipline, and tactics of the British forces over the larger, but disunited, Indian armies. It instilled confidence in the Company's military capabilities and discouraged other Indian powers from directly challenging them.
- Paved the Way for Expansion: With Bengal as a secure base and a rich source of revenue, the British were now in a strong position to expand their influence and control over other parts of India, leading to subsequent conflicts with the Marathas, Mysore, and other regional powers.
What was the primary cause of the Battle of Buxar?
The primary cause was the desire of the allied Indian rulers (Mir Qasim, Shuja-ud-Daulah, and Shah Alam II) to reclaim Bengal, Bihar, and Orissa from the growing influence and control of the British East India Company and to curb British supremacy in the region.
Who were the main participants in the Battle of Buxar?
The battle was fought between the combined forces of Mir Qasim (deposed Nawab of Bengal), Shuja-ud-Daulah (Nawab of Awadh), and Mughal Emperor Shah Alam II, against the British East India Company's army led by Major Hector Munro.
What was the significance of the Treaty of Allahabad?
The Treaty of Allahabad, signed after the Battle of Buxar, was highly significant as it granted the British East India Company the Diwani rights (right to collect revenue) of Bengal, Bihar, and Orissa. This officially established the Company as the de facto ruler of these rich provinces and provided them with immense financial resources, laying the foundation for British colonial rule in India.
How did the Battle of Buxar differ from the Battle of Plassey?
While both battles were crucial for British ascendancy, Plassey (1757) was largely a conspiracy and a betrayal, establishing British political influence in Bengal. Buxar (1764) was a decisive military confrontation where the British army, despite being outnumbered, proved its military superiority against a formidable alliance of Indian rulers, securing actual administrative and revenue control over a vast territory.
What was the 'Dual Government' introduced after Buxar?
The 'Dual Government' (or Dyarchy) was a system introduced by Robert Clive in Bengal after the Treaty of Allahabad. Under this system, the British East India Company held the Diwani (right to collect revenue), while the Nawab retained the Nizamat (administrative and judicial authority). This led to a separation of power without responsibility, resulting in widespread corruption, exploitation, and misgovernance, culminating in the Bengal Famine of 1770.
Source: LearnPro Editorial | International Relations | Published: 7 June 2025 | Last updated: 12 March 2026
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