Helm's Deep is a fictional fortress in J.R.R. Tolkien's Middle-earth, prominently featured in "The Two Towers," part of the Lord of the Rings series. It is located in the valley of the White Mountains and serves as a stronghold for the people of Rohan. The fortress is characterized by its high walls and deep caves, providing protection against enemy attacks. During the War of the Ring, Helm's Deep becomes the site of a significant battle between the forces of Rohan and the invading army of Saruman. The defenders, led by King Théoden, make a desperate stand against overwhelming odds, showcasing themes of bravery and resilience in the face of danger.