Malcolm Archibald 
Warriors Of God [EPUB ebook] 

Years after leaving the 113th Foot, Jack Windrush is sent to the Northwest Frontier of India to investigate reports of gun-running among the Pashtun tribes.
When he discovers that the reports are not only true, but run deeper than initially believed, he is assigned to stop the rogue group and prevent an uprising. Soon, old friends turn into mortal enemies and loyalty becomes a scarce commodity.
As the Islamic revolt against the British rises across the Frontier, can Jack and his unit stop the rebel uprising?