Saturday I watched a program on CSPAN from Lawrence Kaplan. He had written a book about the use of artillery in the Union army during the Civil War. He had used eyewitness statements from a senior artillery officer who was involved in the creation of the Union artillery organization. The author noted that over 15,000 books are available on the CW and many hundred about the Union artillery, but only one from an eyewitness account.
At the beginning of the war, the Union army attached one artillery battery to each infantry brigade, or four per Division. Quite a coincidence for some of you! Unfortunately, this practically made the artillery useless, since each battery Captain was mostly forgotten by the infantry Brigade Commander. The Division's batteries were never massed into one solid punch or positioned by artillery officers where the guns would have the best line of fire. In one battle, the guns of a Division just ended up in a traffic jam in a nearby town.
Actually, Kaplan points out that in several early defeats, this disorganization most probably robbed the Union of victory. When the batteries were finally put into artillery battalions at Corps level the Union started winning important battles, like Gettysburg. So the unknown game mechanic governing artillery batteries may not work best when they are kept at stack level, but to be historically correct, perhaps it should.
http://www.c-span.org/video/?320927-1/discussion-union-army-field-artillery