The new Nawab of Bengal, Siraj-ud-Daula, decided to reduce East India Company influence and, using a dispute about British fortification of the city, he ousted them. He then imprisoned 146 Europeans in a small cell and 123 died from heat exhaustion. The episode, which was probably the result of accident or simple incompetence by lower ranks, became known as “the Black Hole of Calcutta” and became a symbol of æoriental barbarism’.
Editors. "British ousted from Calcutta by Mogul forces". The Literary Encyclopedia. First published 01 February 2010
[http://www.litencyc.com/php/stopics.php?rec=true&UID=4182, accessed 29 June 2016.]