Original sentence: Encouraged by Mabel Grujić, the American wife of the Serbian Undersecretary for Foreign Affairs, Lady Paget helped set up a military hospital in Belgrade during the First Balkan War (1912-13), in which Serbia doubled its size
Edited sentence: Encouraged by Mabel Grujić, the American wife of the Serbian Undersecretary for Foreign Affairs, Lady Paget helped set up a military hospital in Belgrade during the triumphal First Balkan War, 1912-1913, in which Serbia doubled its size