Ghiyath al-Din Balban's campaign of Bengal (1277âÂÂ1281) was a major expedition to reconsolidate Delhi Sultanate's authority over Bengal. In 1279, the Sultan of Delhi, faced significant challenges against the authority and military prowess. Amidst the crisis, Tughral Tughan Khan, the Delhi Sultanate's governor of Bengal, rebelled and declared sovereignty. In response, Balban ordered Amin Khan, the governor of Oudh, to suppress Tughral's rebellion. Amin Khan's forces were decisively defeated. Two more armies led by Tirmati Khan, and Shahabuddin Bahadur were also defeated by Tughral in the following years.
Despite his deteriorating health, Balban personally led a fourth campaign against Tughral, mobilizing an army over 200,000 additional. Thousands of boats facilitated the movement of soldiers and supplies along the Ganges. Upon learning of Balban's approach, Tughral Khan fled the Bengali capital, which was subsequently occupied by royal forces without resistance. Tughral sought refuge in the jungles of Jajnagar but was eventually captured and executed. His head was presented to Balban, who, in a display of retribution, ordered harsh reprisals against Tughral's allies and relatives.
In 1277, Ghiyath al-Din Balban, () seriously fell ill. Stricken by a severe illness that confined him to his bed, Balban's survival was uncertain. In 1279, the Mongols launched a formidable offensive in Punjab, engaging the royal army under Prince Muhammad Khan in a fierce conflict. Concurrently, Tughral Tughan Khan, the Mamluk governor of Bengal and a former slave officer of Balban, led successful campaign against Jajnagar (in modern Orissa). He obtained from there considerable treasures and many elephants and appropriated them. He did not send anything to the Sultan, citing his old age and preoccupation with Mongol invasions. Feeling confident of his power, eventually asserted independence and withheld the kingâÂÂs share (Khums) of the spoils. He took the regnal name of Sultan Mughisuddin, issued coins, read khutbah in his own name and declared his independence, further destabilizing the sultanate. Lakhnauti had thus earned at Delhi the nickname of Balghakpur "the city of rebellion"
In response, Balban ordered Amin Khan, the governor of Oudh (Awadh), to suppress Tughral's rebellion. In 1277, Amin Khan proceeded with his army. Tughral confronted Amin Khan with his forces. A significant military engagement occurred near the Ghagra River in northern Bihar where Tughral decisively defeated the forces of Amin Khan. During the battle, some of Amin Khan's troops defected to Tughral which the rebel won over through lavish grants of gifts. While retreating, the imperial army suffered heavy casualties at the hands of local Hindu tribes in Awadh. The defeat severely undermined Balban's reputation, leading him to order the execution of the defeated commander, who was hanged at the Awadh gate in a display of the sultan's rage.
In January 1278, a second royal army, led by Tirmati Khan, along with Tamar Khan Shamsh and Malik Tajuddin advanced towards Bengal crossing river Sarju. Their advance was halted by Tughral somewhere between Tirhut and Lakhnauti. Tughral's army, though weaker in cavalry, outnumbered the imperial forces and was strengthened by numerous elephants and Hindu foot soldiers (paiks), making it a formidable force. The two armies faced each other for an extended period, during which Tughral bribed several officers in the imperial camp. When battle commenced, the Delhi troops, possibly led by two Shamsi nobles, remained neutral, leading to a crushing defeat for Malik Tirmati's imperial forces. Fleeing imperial soldiers were plundered by Hindus, and many, fearing Sultan Balban's harsh punishment, chose to join Tughral in Lakhnauti. Tirmati's was gibbeted on the Sultan's orders.
Tughral also repulsed the third expedition, led by Shahabuddin Bahadur, the Amir of Oudh in 1279. Advancing through Tirhut towards Lakhnauti, Bahadur engaged Tughral's forces at the frontier. He pledged to capture Tughral alive. A fierce battle ensued, Tughral charged at Bahadur's center who fought bravely. But a critical division of the imperial army collapsed and fled during the battle, leading to Bahadur's retreat in defeat. Bahadur with his fugitive soldiers returned Delhi, Balban wanted to put him to death, but BahadurâÂÂs friends succeeded in saving his life by giving proofs of his courage on the battle-field. Balban exiled him from the court.
These successive defeats galvanized Balban's military commanders, who rallied to quell the revolt.
The successive defeats enraged Balban who swore never to return without the rebelâÂÂs head. He left Delhi and marches towards Samana and Saman. In January 1280, Sultan Balban, accompanied by his second son Bughra Khan, embarked on the military campaign, leaving Delhi under the regency of his trusted friend, Malik Fakhruddin, the kotwal. In March, upon reaching Awadh the Delhi army bolstered by over 200,000 additional troops provided by the iqtadars of the Gangetic valley. The number of troops may be as high as 300,000. The army was composed of horsemen, foot-soldiers, paiks, archers, Kahars, Kaiwani (bow-men), riders on ponies, arrow-shooters, slaves, servants, merchants and shopkeepers. Thousands of boats facilitated the movement of soldiers and supplies along the Ganges.
Tughral Khan positioned his war-boat fleet at the Sarju River's mouth to monitor the imperial army rather than engage in combat. Sultan Balban, despite the late season, led the main army from Oudh, with Bughra Khan commanding the rear. When Balban crossed the Sarju unopposed, Tughral retreated to Lakhnauti. Tughral, unwilling to engage in direct confrontation, gathered his treasure and followers and hastily abandoned Lakhnauti and moved to "Hajinagar" a place several miles east of Sonargaon. Tughral relied on the challenging climate and waterlogged terrain of the province to exhaust Balban's Delhi forces and test the sultan's patience, hoping to later reclaim the capital from a secure retreat. Undeterred, Balban swiftly advanced, capturing the deserted city of Lakhnauti. He appointed Malik Husamuddin to govern the city and maintain communication with the main army, while promptly resuming his pursuit of Tughral.
Sultan Balban advanced to East Bengal and, upon reaching Sonargaon, met with the local Hindu raja Nauja, likely Danujamadhava Ariraja Dasaratha of the Deva dynasty. He was an independent ruler, received respect from Balban as a sovereign prince during negotiations. In exchange for his cooperation in apprehending Tughral, Danuja agreed to block TughralâÂÂs escape via the rivers in his territory. Balban moved eastwards by continuous marches till he reached within 120 miles of Hajinagar, but no trace of Tughral could be found.
Tughral sought refuge in the jungles of Jajnagar with his entire army, harem and family. Sultan Balban dispatched a division of 7,000 to 8,000 troops under Malik Bekturs, ordering them to advance ahead of the main army and deploy small scouting parties to gather intelligence. The imperial army proceeded toward the Jajnagar territory. One day, scouts led by Malik Sherandaz and Malik Muqaddir, encountered grain merchants returning to their villages. Suspecting they had come from TughralâÂÂs camp, Sherandaz seized them and executed two, terrifying the others into revealing TughralâÂÂs armyâÂÂs location, encamped half a kos away on a riverbank. Malik Sherandaz and his band of 30 or 40 horsemen rode cautiously towards the enemy camp. Observing TughralâÂÂs men drinking, singing, and their animals grazing, Sherandaz and his scouts launched a surprise attack on the camp, swords drawn, shouting for Tughral. The sudden assault caused panic, with Tughral's forces believing BalbanâÂÂs entire army was attacking. Tughral had nearly reached the river when an officer named Ali struck him with a short battle-axe and knocked him down from his horse. Malik Muqaddar immediately got down from his horse, chopped off TughralâÂÂs head and threw his body into the river. Ali thenceforward known as Tughril-Kush or 'the Slayer of Tughril'.
Shortly after Malik Berbek Bekturs arrived the scene and learned the report in details. He at first was angry. His anger soon faded away after Sultan Balban promoted the soldiers who participated in that assault.
Muqaddir sent Tughral's head to Bekturs, who presented to Balban. Balban, in a display of retribution, ordered harsh reprisals against Tughral's friends, supporters, and relatives. The demoralised force was surrounded and nearly the whole of it was captured. Sultan Balban returned with a huge amount of booty entered Lakhnauti in triumph. He hanged TughralâÂÂs sons, sons-in-law, ministers, high officials, favored ghulams (Mamluks), sar-lashkars (army officers), jan-dÃÂrs (bodyguards), armor-bearers and paiks. These brutal punishments continued for two-three days. The Muftis and Qadis barely obtained pardon. The defectors were singled out for execution in Delhi to serve as a warning to their families and associates. Ordinary offenders were pardoned, those with slightly higher status faced temporary punishment, higher-ranking ones were imprisoned, and officers were paraded on buffaloes through Delhi's streets. BalbanâÂÂs extreme cruelty shocked even his own followers. Balban then appointed his son Nasiruddin Bughra Khan as the governor of Bengal. In April 1282, he left Bengal proceeding through Oudh and Badaun, and reached Delhi after an absence of three years.
Bughra Khan governed lakhnauti from 1281 to 1287 and after Balban's death he declared himself as the independent sultan of Bengal assuming the title Sultan Nasiruddin Mahmud. He had coins and Khutbah read in his own name. He ruled the region until 1291. His successors would rule Bengal until Ghiyas-ud-din Tughlaq's annexation in 1324.