Artillery...
Big question! Could you read Jomini, "Précis de l'Art de la Guerre", Chapter VII, Article 46...
He talked about the use of artillery... Very interesting... There are some rules, and I think we can say- after reading his text- one of them is "there isn't a real rule"... just some ideas...
IN HW, the AI in charge of artillery tries to adopt this rule :
a) doctrine
b) but when there is a threat, gunner don't take care at the doctrine and they open the fire at the threat
That said, there are several texts about the doctrines.. for example T de Moria's Tratado de Artillerie,.. but I have to search the other references
and several texts talking about the battle.. for example at Austerlitz, Lannes asked to his gunners to destroy the Bagration's artillery which was firing at his infantry... some minutes after, the russian artillery was broken.
JMM