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.
The Army, Navy, and Marine Corps were established in 1775, in concurrence with the American Revolution. The War Department was established in 1789, and was the precursor to what is now the Department of Defense. One year later, in 1790, the Coast Guard (part of Homeland Security in peace time) was established. This was followed by the founding of the Department of the Navy in 1798.