Artillery
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Artillery is a word for big guns used in an army, for example cannons and howitzers.
Such guns are used to shoot targets far away. Artillery is often used to deny area to enemy troops, to bombard trenches and buildings with enemies in it and to support units.
There are many different weapons that are called artillery. They may shoot shells or missiles. Newer systems can even drop mines over a big area, making the area uncrossable. There is also artillery that fights planes and other aircraft.
In most cases, artillery needs other units to see for it, because it often shoots in high angles and over terrain. They do not have to see the enemy to damage them.