The 4th Army is a military formation that has been part of various national armies, notably during significant conflicts such as World War I and World War II. It typically consists of several corps and divisions, organized to conduct large-scale operations. The structure allows for flexibility in deployment and command, adapting to different combat scenarios. In the context of the United States Army, the 4th Army was established during World War II to oversee training and support for troops. It played a crucial role in preparing soldiers for combat, ensuring they were equipped with the necessary skills and resources for success on the battlefield.