In which battle did Marines earn the nickname "Devil Dogs"?

The nickname "Devil Dogs" was earned by Marines during the Battle of Belleau Wood in 1918, a significant engagement in World War I. This battle showcased the determination and tenacity of the U.S. Marine Corps as they faced fierce opposition from German forces. The term was reportedly used by German soldiers to describe the Marines, who fought valiantly through difficult conditions and sustained heavy casualties while advancing into enemy territory. The fierce fighting and the bravery exhibited by the Marines during this battle left a lasting legacy and cemented their reputation as some of the toughest soldiers in warfare.

The other battles listed, while notable in Marine Corps history, do not share the origin of the nickname. Guadalcanal and Iwo Jima are significant due to their strategic importance in World War II, and the Tet Offensive is a crucial point in the Vietnam War, but none of these battles are associated with the "Devil Dogs" moniker.