word is derived from the Old French verb attilier, meaning "to equip". This term includes coastal artillery which traditionally defended coastal areas against seaborne attack and controlled the passage of ships using their ability to deny access through the threat of coastal fire. It also includes land-based field artillery. With the advent of powered flight at the start of the 20th century, artillery also included ground-based anti-aircraft batteries. Combined arms Combined arms is an approach to warfare which seeks to integrate different arms of a military to achieve mutually complementary effects, such as, self-propelled artillery, mechanized infantry, aircraft and so forth. By landscape and climate Arctic warfare Desert warfare Jungle warfare Mountain warfare Urban warfare Notes Further reading Christopher Tuck. Understanding Land Warfare. London–NY: Routledge, 2014. Warfare by type