Which battle is known as the largest all-Marine battle in history?

Iwo Jima is recognized as the largest all-Marine battle in history due to its scale, the number of Marines involved, and its significant strategic importance during World War II. This battle, which took place over a month from February to March 1945, saw the United States Marine Corps engage in one of the most intense and iconic fights against Japanese forces. The objective was to secure the island, which was crucial for the U.S. as a staging area for operations in the Japanese home islands.

The battle is particularly notable for the fierce resistance put up by Japanese defenders, as well as the high casualty rate on both sides. The image of the Marines raising the American flag on Mount Suribachi has become emblematic of Marine valor and sacrifice. The extensive involvement of Marine Corps units, coupled with the tactical and operational lessons learned during this intense engagement, solidifies Iwo Jima’s status in military history.

In contrast, while other battles listed also featured significant Marine Corps participation, they did not exclusively involve Marines in the same capacity or scale as Iwo Jima, which is why it holds this unique distinction in Marine Corps history.