First invasion (1742) In 1742, Bengal experienced its initial encounter with the Maratha invasion. In April, Maratha forces under Bhaskar Ram sent by Raghuji Bhonsle to collect
chauth tribute, invaded
Bengal via
Odisha. They advanced unopposed through Odisha and Panchet, near modern
Raniganj, reaching near Burdwan. Nawab Alivardi Khan rushed to Burdwan on 15 April but faced constant Maratha skirmishes and plundering, causing severe food shortages. He broke through to
Katwa amid heavy losses and hardships. At Katwa, the Marathas had already plundered and burned granaries. A Maratha detachment under Mir Habib who had defected now with the Marathas, raided Nawab's capital
Murshidabad in early May. Alivardi hurried back, arriving on 7 May; the Marathas retreated to Katwa, looting villages en route. As rains approached, the Marathas considered withdrawing, but Mir Habib convinced them to stay. They captured Hooghly, installed Shesh Rao as governor, and used Katwa as headquarters, aiming to expand beyond the
Hooghly River toward
Dhaka. During the 1742 rainy season, fighting paused, but Marathas ravaged
Burdwan, Murshidabad,
Nadia,
Birbhum,
Midnapore,
Santal Parganas, and Odisha up to
Balasore, committing atrocities. Gangaram wrote in his poems that the people fled with belongings, only to be
robbed,
mutilated, or killed; women were abducted and
raped, villages burned. Many Bengalis migrated eastward for safety. Alivardi used the lull to regroup at camps near Murshidabad, reinforced by nephew the
Naib Nazim of
Bihar Zain-ud-Din Ahmed Khan and Saif Khan from
Purnia. In late September 1742, he launched a surprise attack on Bhaskar Ram's camp at Katwa routing the Marathas. They fled across the
Bhagirathi and
Ajay rivers; Alivardi pursued through Panchet,
Bankura, Midnapore, and Odisha, driving them beyond
Chilika Lake by December. En route, Marathas plundered towns and killed Odisha's deputy governor Shaikh Masum at Jaipur. Alivardi appointed Abdul Nabi Khan as replacement and returned to Murshidabad on 10 February 1743 after two months in Odisha.
Alivardi Khan successfully repelled the invasion, although not without the unfortunate consequence of
Murshidabad and
Hooghly suffering from plundering.
Second invasion (1743) Raghuji I lead the Marathas and attacked and captured
Katwa and
Hooghly in
Bengal.
Alivardi Khan conscripted tribal and peasant levies from
Birbhum. He responded to the Maratha attack by attacking the Maratha camp at Katwa in the First Battle of Katwa from the rear, at nightfall leading to a Subah victory. The Marathas believing a much larger force had been mobilized, evacuated out of Bengal on 17 September 1742.
Bhaskar Pant the Maratha commander, was killed in action. In 1743, Raghuji occupied Burdwan with his camp at Katwa.
Third invasion (1744) The Marathas tried again in 1745 where they succeeded in occupying
Orissa to take Katwa. The force of 20,000 horsemen ravaged
Murshidabad and moved onwards to
Katwa. The force was led by
Raghuji Bhonsle, the Maratha ruler of
Nagpur where he and his force were defeated by
Alivardi Khan at the Second Battle of Katwa.
Fifth invasion (1748–1751) Janoji Bhonsle and
Mir Habib enlisted in the army of Afghans at Rani Sarai to fight against Alivardi Khan at the
Battle of Rani Sarai.
Alivardi Khan was able to break the Afghan lines and make them retreat through the use of war elephants by his eager generals and eventually he won the battle. == Campaign timeline ==