Most decisive battles in history are remembered for their heroics. The battle of Chausa is remembered for a night attack, a catastrophic Mughal retreat, and an emperor who survived by clinging to a water-carrier’s inflated animal skin while crossing a river in the dark.
That image — Humayun, Emperor of Hindustan, floating across the Ganga on what was essentially a makeshift raft — tells you everything about how badly the battle of Chausa 1539 went for the Mughals.
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Setting the Scene: What Led to Chausa
Humayun became emperor in 1530 after his father Babur died. He inherited a freshly won empire — Babur had only taken Delhi in 1526. The Mughal hold on Hindustan was still thin. Local Afghan nobles resented their new rulers. And in Bihar, a man named Farid Khan — who would become known as Sher Shah Suri — was quietly building power.
Sher Shah started as a jagirdar’s son who proved his ability in the service of Bihar’s Afghan rulers. He rose steadily through administrative talent and military sharpness. By the 1530s, he controlled Bihar and was making moves into Bengal.
Humayun, meanwhile, was dealing with his brothers. Kamran controlled Punjab and Kabul. Hindal and Askari were problems of their own kind. The Mughal family was fractured, and Sher Shah understood this perfectly — it was one of the reasons he moved when he did.
The Armies Before the Battle of Chausa 1539
The battle of Chausa fought between Humayun’s Mughals and Sher Shah’s Afghan forces didn’t begin with an open engagement. It began with a standoff that lasted months.
Humayun crossed into Bihar to deal with Sher Shah in 1538. He captured the fortress of Chunar and then moved toward Bengal, where his brother Hindal had created a political mess. By the time Humayun was ready to deal with Sher Shah directly, the campaigning season had dragged on far too long.
The two armies camped near each other on the banks of the Ganga near Chausa, in present-day Bihar — for nearly three months. Sher Shah didn’t attack immediately. He used the time well. He built up intelligence on Mughal positions.
Humayun, on the other hand, waited for a different reason — he wanted to negotiate. He sent envoys. He was genuinely trying to reach a settlement that would let Sher Shah remain a powerful but subordinate figure in the east.
The Battle of Chausa: June 26, 1539
The battle of Chausa was fought on June 26, 1539 — in the middle of the monsoon season. That timing was not accidental.
Sher Shah chose a night when Humayun’s camp had relaxed its guard slightly. A storm may have been building — accounts vary — but the conditions were difficult. Mughal sentries were less alert. The terrain near the river was muddy and difficult.
Sher Shah launched a coordinated surprise attack in the early hours. His forces hit the Mughal camp from multiple directions simultaneously. The Mughals — camped on the riverbank with the Ganga behind them — had almost nowhere to go.
The confusion in the Mughal camp was immediate and total. There was no time to form proper defensive lines. There was no time for Humayun to organise a meaningful response. The camp collapsed into chaos as soldiers tried to flee in every direction.
Humayun’s Escape and the Nizam Story
The moment most associated with the battle of Chausa 1539 is Humayun’s escape.
As the Mughal camp broke and men fled toward the river, Humayun found himself at the water’s edge with no good options. Accounts from the period — including from Gulbadan Begum, Humayun’s half-sister who later wrote a memoir — describe how a water-carrier named Nizam helped the emperor cross the Ganga using an inflated mashk, a type of animal-skin float.
In gratitude for saving his life, Humayun allegedly allowed Nizam to sit on the imperial throne for half a day and to conduct court. Whether literally true or slightly embellished by later accounts, the story has stuck — because it captures something real about the scale of the humiliation.
Who Won the Battle of Chausa?
Who won battle of Chausa — Sher Shah Suri won, and he won decisively.
The victory wasn’t just a military outcome. Sher Shah took Humayun’s war chest, his artillery, his supplies, and the practical control of Bihar and eastern territories. More importantly, he used the victory to proclaim himself Sultan of Hindustan. He had coins struck in his name.
This proclamation mattered as much as the battle itself. It signalled to Afghan nobles, to Rajput chiefs, and to rulers across northern India that Mughal dominance was not inevitable — that it could be challenged and beaten.
Humayun vs Sher Shah Suri: Why Humayun Was Outplayed
The Humayun vs Sher Shah Suri contest at Chausa was decided well before the night attack.
Looking at the broader campaign, several things stand out about why Humayun lost:
- He negotiated when he should have fought — months of talks gave Sher Shah time to prepare while the Mughal army sat in a monsoon camp losing health and morale
- He chose a vulnerable position — camping with the Ganga at his back removed any strategic flexibility once the attack came
- His brothers provided no help — Kamran, who controlled Punjab and its substantial military resources, sent nothing. Humayun fought this campaign essentially without Mughal reserves
- He underestimated Sher Shah’s intelligence — the night attack succeeded partly because Sher Shah knew the Mughal camp layout, timing, and guard schedules better than Humayun’s commanders knew his
What the Battle of Chausa Meant for Indian History
The battle of Chausa set the chain of events that would unfold over the next sixteen years.
Humayun would fight Sher Shah again — at Kannauj in 1540 — and lose again, more completely this time. He would then spend over a decade in exile: wandering through Sindh, seeking refuge in Rajputana, eventually finding shelter at the Safavid court of Shah Tahmasp in Persia.
Sher Shah Suri would rule Hindustan for five years — from 1540 to his death in 1545 — and accomplish more in that time than most rulers manage in decades. The Grand Trunk Road. The rupee is a standardised silver currency. A reformed land revenue system.
FAQs About the Battle of Chausa
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When and where was the battle of Chausa fought?
The battle of Chausa was fought on June 26, 1539. It took place near Chausa, a location on the banks of the Ganga river in present-day Buxar district of Bihar, India. The two armies had been camped in the area for several months before Sher Shah Suri launched his surprise night attack on the Mughal camp.
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Who fought in the battle of Chausa — what were the two sides?
The battle of Chausa was fought between the Mughal emperor Humayun and the Afghan commander Sher Shah Suri, who at the time controlled Bihar and had significant influence in Bengal. Humayun was attempting to reassert Mughal authority in the east.
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Who won the battle of Chausa and what happened immediately after?
Who won battle of Chausa — Sher Shah Suri won comprehensively. After the victory, he declared himself Sultan of Hindustan and had coins struck in his own name. Humayun survived by crossing the Ganga with the help of a water-carrier, but lost a large part of his army, his supplies, and his artillery in the disaster.
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What role did the Ganga river play in the battle of Chausa 1539?
The Ganga was central to the outcome of the battle of Chausa 1539. Humayun’s army was camped with the river directly behind them. When Sher Shah’s night attack broke the Mughal camp, soldiers fleeing toward the river had no organised way to cross. Thousands drowned.
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How did the battle of Chausa lead to Humayun’s exile?
Chausa was the first major military defeat in the Humayun vs Sher Shah Suri conflict. It demonstrated that Sher Shah could beat the Mughals in open campaigning. The following year, at the battle of Kannauj in 1540, Sher Shah defeated Humayun again — this time completely. With no army left and no support from his brothers, Humayun fled into Sindh and eventually to Persia, remaining in exile until 1555.