Fire in anger
"Fire in anger" is a phrase used in military contexts to describe the use of a projectile weapon
A weapon, arm, or armament is a tool or instrument used with the aim of causing damage or harm to living beings or artificial structures or systems...

 to deliberately cause damage or harm to an opponent, as opposed to training exercises
Target practice
Target practice refers to any exercise in which projectiles are fired at a specified target, usually to improve the aim of the person or persons firing the weapon....

 or warning shot
Warning shot
A warning shot is a military term describing harmless artillery shot or gunshot intended to call attention and demand some action of compliance...

s. For example, Napier of Magdala Battery
Napier of Magdala Battery
Napier of Magdala Battery is a coastal battery on the south-western cliffs of the British overseas territory of Gibraltar, overlooking the Bay of Gibraltar near Rosia Bay.-History:...

 "never fired a shot in anger"; the battery
Coastal artillery
Coastal artillery is the branch of armed forces concerned with operating anti-ship artillery or fixed gun batteries in coastal fortifications....

never engaged in combat. Despite the use of the word "anger", the phrase is not intended to describe the emotional state of the firer.
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