An adjective referring to the military, the word martial adds a warlike tone to any noun it describes.
The word martial derives from Mars, the Roman god of war. It refers to almost much anything military, including "martial law," in which the government orders the military to administer the law. The word definitely makes one think of fighting, as in the physical discipline known as the martial arts. But there is a lighter side to the word, too. Martial music, usually associated with the military, is usually bright and inspiring.