In November 1915 as commander of the Gendarmerie in Hamedan he launched an attack on the pro-Russian Persian Cossack Brigade at the Battle of Musalla. His gendarmes managed to disarm the Persian Cossacks and Mohammad Taqi managed to convince some of the cossacks to join his forces in a patriotic speech he made to them after their defeat. Mohammad Taqi and Major Azizollah Khan Zarghami as Gendarmerie commanders could not defend Hamedan against an advancing Russian Caucasus Army which was superior in numbers and weapons. The gendarmes retreated to Kermanshah where they were defeated by the Russians, with many fleeing to the Ottoman Empire.