Counter battery fire question

[jivemi]

Originally Posted by Mobhack

The likelihood of an off-map battery being located for C/B goes up as the game goes on, due to the target battery usually having fired more often as the game progresses.

Early in a Russian LC battle (turn 3 or 4 IIRC) a recently upgraded 122mm battery (experience 88) fired off-map CB against one of three German 10.5cm batteries, scoring one hit. For quite a few turns none of those batteries fired at all. Then, around turn 12 or so they all started firing again, without any response from the 122mm, which was idle throughout the battle except for that single CB salvo. Is this normal? Thanks.