Another source would be the book "Lives of the Officers of the Bengal Army, 1758-1834" by V. C .P. Hodson (in 4 volumes). If you can’t access the book, it is available on LDS microfilm. (3 films)
For more details, see the FIBIS Fibiwiki page Bengal Army, section Books
http://wiki.fibis.org/index.php?title=Bengal_Army#BooksCheers
Maureen