Map of the capture of Chapoo
The Oxford Geographical Institute
Robert S. Rait (1903). <i><a rel="nofollow" class="external text" href="https://archive.org/stream/cu31924088002120#page/n309">The Life and Campaigns of Hugh, First Viscount Gough, Field-Marshal</a></i>. Volume 1. Archibald Constable &amp; Co Ltd. p. 266.