Tronoša was badly damaged during the World War I. During the Battle of Cer in 1914, Serbian wounded soldiers were transported to the monastery for medical treatments. After Austria-Hungary occupied Serbia, their army burned the church books. The also destroyed or removed all doors in the complex, which were repaired only in 1923. In August 1941, a local Chetnik rebellion liberated Loznica ("the first town liberated from Germans in the occupied Europe") in the Battle of Loznica, and Tronoša's hegumen Georgije Bojić was active in the planning and conducting of the operation. as an aide to Veselin Misita, in charge of the attack. When German reoccupied the area in October 1941 they burned the monastery books and punched through one of the walls with the cannonball.