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Karla M also that British raised a great deal of soldiers from Punjab, mainly from upper punjab.. Punjab was also their first line of defence to safeguard India from the Russians in "the great game".. they gave land to different tribes, such as Khosa, Laghari etc on the bordering side of the Punjab, who in return raised personnel and horses for the british army, this way their loyalty was bought.. soon after the urge to join Army as officers also rose, and that is why eventually British had to induct Indian officers in the Royal Army..
this you can add in the background, if you like.
alright, the standard 30/70 rule applies I guess... fair, I will ask a friend to forward if he has any thesis related to your topic..