Cannons are a bit odd in P&M. The only cannons worth fielding, in my view, are regimental cannons. However, they are so strong that I've actually lately taken to forbidding myself from using them as a house rule. They need a military academy and a basic forge, IIRC. The regimentals function essentially like a super-archer- they are entirely moveable, fire four shots per volley, and because their size is so small, they are capable of racking valor up like nobody's business. An entirely lethal unit.
2. There are "hidden" requirements for the tertio line. You need at least a basic level of most of the military buildings, including a horse breeder, in order to start the military tech upgrades. I belive upgraded gunsmiths of some sort are also required.
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