Battle of Miani

The Battle of Miani (February 17, 1843) was a battle between British forces under Sir Charles Napier and the Talpur rulers of Sindh (now a province of Pakistan).
Reason.
The British were upset about the local rulers' stance during the First Anglo-Afghan War (1839–42). After Napier first gained military control of the region by forcing an agreement with the Sindh amirs, his forces attacked the fortress at Imamgarh. After the attack on Imamgarh a popular revolt broke out against the British by the people of Sindh
The Battle of Miani (also known as Meeanee by the British) was the decisive victory that allowed British to take control of all of Sindh (apart from the state of Khairpur).
Later, on March 24, 1843, Mir Sher Muhammad Khan Talpur, the ruler of Southeastern Sindh (Mirpurkhas) tried to liberate Sindh from the occupation of the British East India Company forces at the Battle of Dubbo but he could not succeed
Casualties.
More than twenty thousand Baloch forces were killed while fighting British invaders.