Someone forgot about great counter barrage.
Counter-barrage is useless, you are better off just shooting at enemy artillery manually because;
-It doesn't fire as many shells as a normal barrage
-It's not even more accurate
-You can't control it and it has a cooldown like the normal barrage
Like seriously it's flabbergasting how many times Iv turned it on for it to only shoot at a mortar instead of the enemy howitzer. Iv found much better luck just shooting at the enemy artillery manually and hoping for the best. If you have a LeFH counter-barrage a ML-20 and the ML-20 shoots back the ML-20 will almost always win.