The key to artillery is to have it shoot down the length of the AI line as opposed to shooting directly at it just as IlDuce mentioned above. Artillery of the era was particulary difficult to find the range for so it was ineffective when firing at a parallel battle line. A great example of this in historical context was at the battle of Gettysburg on the third day before Picket's charge. Lee's bombardment of the Federal lines was basically ineffective due to a lack of depth of target to shoot at, even though it used some 270 some odd cannon (I am not certain on this number, but am relying on my memory here). Basically take IlDuce advice and put the cannons on the flanks of your line and not in the center/direcly behind.
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