
1) Artillery operation
Found on
https://www.crosswordclues.com/clue/predicted-fire

File:Hill_70_-_Map_of_harassing_fire.jpg|thumb|Map used for planning harassing fire in the Lens sector, May 1917Predicted fire (originally called map shooting) is a tactical technique for the use of artillery, enabling it to fire for effect without alerting the enemy with ranging shots or a lengthy preliminary bombardment. The guns are laid using ...
Found on
http://en.wikipedia.org/wiki/Predicted_fire

(from the article `artillery`) During World War I it became tactically desirable to bombard an enemy position without alerting him by ranging shots. This brought about the ...
Found on
http://www.britannica.com/eb/a-z/p/107
No exact match found.