Answer:
Blood transfusions.
Step-by-step explanation:
Due to war in the industrial period, many new operations were performed such as blood transfusions etc which is also practiced in this modern period. Due to this blood transfusion operation, many soldiers were saved from critical injuries. Before this technique, most people were died due to loss of blood but with this method, soldiers were saved and now this method is also extensively used for the patients in the hospitals.