Original: While more stringent measures were being organized, Major Battye and Captain Urmston and some sepoys of the Fifth Gurkhas were surprised and killed by Gujar dependants of the Akazai.
Simplified: While the British were planning tougher attacks - Major Battye and Captain Urmston and some soldiers of the 5th Gurkhas were surprised and killed by the Gujar tribe (who were allies of the Akazai tribe).