The two sides involved in World War I were the Allies and the Central Powers. Both sides had basically the same weapons, and once the war got into the Trench Warfare stage it was nearly impossible for either side to win.Trench warfare started in 1914, and continued until the end of the war.
The history of the United States Marine Corps (USMC) begins with the founding of the Continental Marines on 10 November 1775 to conduct ship-to-ship fighting, provide shipboard security and discipline enforcement, and assist in landing forces.
Credit: U.S. Navy Getty Images. The Navy and the Marines were both established in 1775. The Marines were part of the Navy at that time and considered the Navy's ground force. In 1798, the Marines were established as a separate branch of the military. Navy ships attack targets on both the land and in the water. The Navy supports the Air Force by providing runways at sea and transporting air craft.