Counter-battery

Counter-battery fire (sometimes called counter-fire) is a battlefield military activity to defeat the enemy's indirect fire elements (guns, rocket launchers, artillery and mortars), including their target acquisition, command and control components. Counter-battery arrangements and responsibilities vary between nations but involve target acquisition, planning and control, and counter-fire. Counter-battery fire rose to prominence in World War I.

Counter-battery radar detects incoming indirect fire and calculates where it was fired from. That location data can be sent by a communications link to friendly forces, who can then fire on the enemy positions, hopefully before they can reposition (the "scoot" part of shoot and scoot tactics). Counter-RAM systems track incoming rocket, artillery, and mortar fire and attempt to intercept and destroy the projectiles or provide early warning to the target area.

Indirect fire was introduced so that artillery could fire from behind cover to reduce its exposure to enemy artillery by making itself more difficult to find. Interestingly, while armies were doing this, little thought was given to the need for counter-counter measures. Perhaps the only means of finding concealed guns was observation from kites or balloons. However, effective counter-battery fire needs far more than a single method of observation. Counter-battery (CB) fire emerged and developed extremely quickly during World War I. Since that war, CB has continued to evolve, mainly due to improvements in technology.

The targets of CB fire are usually the enemy's guns, launchers and mortars, both the materiel and the men serving them. The formal NATO definition of the term counter-battery is "fire delivered for the purpose of destroying or neutralising the enemy's fire support system", with the note that it may be proactive or reactive. This may be achieved by attacks on any part of the field artillery system. In some armies at some periods CB has been called 'counter-bombardment' and occasionally 'counter-mortar' has been handled somewhat separately.

...
Wikipedia