After reading M.G. Singh's post in these forums impressing on the point that, Caste is never a criteria for bravery, I found the reality that it's not the Caste, it's the "Cause" that matters.
This is a breathtaking collection of soldiers from undivided India which includes today's India, Pakistan, Bangladesh and Burma - were sent to fight in WWI between 1914 and 1918 in France, Belgium, Egypt and the Middle East.
http://www.bbc.com/news/world-asia-india-31937266