what are the card states
Artillery is a class of heavy military weapons built to fire munitions far beyond the range and power of infantry's small arms. Early artillery development focused on the ability to breach defensive walls, and fortifications during sieges, and led to heavy, fairly immobile siege engines. As technology improved, lighter, more mobile field artillery cannons developed for battlefield use. This development continues today; modern self-propelled artillery vehicles are highly mobile weapons of great versatility providing the large share of an army's total firepower.
Artillery is a building that you can build in your bases. Existing artillery can be called to fire at your targets during tactical combat by radioman.
Take note though: artillery has limited range around the structure, so you are on your own during long range missions!