Bengal endured the most catastrophic famine between 1769 and 1773. The famine also included some regions of Bihar and Orissa, but Bengal was the worst affected region. The population in Bengal was reduced to 30 million with death of one-third of its population.
In 1768 there was deficit in agricultural produce, which was nothing out of ordinary. The following year the same trend continued, but on a more severe scale. In September of 1769 there was severe drought leading to even more shortage of food.
By mid-1770 death from starvation was occurring on a large scale. The famine resulted in mass migration of surviving population towards jungles, who never returned for decades to come.