The Third battle of Panipat was fought in 1761 between Ahmad Shah Abdali and Marathas under Sadashivrao Bhau,vishwasrao,mahadaji shinde.

‘Kala Amb’ is a memorial built in memory of the maratha soldiers who died in the battlefield of Panipat. It is said that blood of the dead soldiers was mixed with the soil and the fruit of a mango tree became black in color due to that and hence the name “Kala Amb” meaning ‘Black Mango’.
Source:wikmapia