Essentially a Fire-and-Go unit, you will lay down massive amounts of DPS from these guys, but be wary of keeping them firing for too long especially if you're in a bad position, as they will tend to get noticed and then targeted after a short period of time, whether that be from scorpios, muskets, etc. Which is where the mobility doctrine comes into play for dodging those types of attacks, sending them to resupply faster, or repositioning them for better spots/angles. Their mastery pretty much covers their need to deal with cavalry so picking up the last node on bottom line isn't that important, along with the Fusillade doctrine providing 8% damage dealt to cavalry as a random bonus, and then the rest of those damage doctrines. Leadership can be replaced if preferred but it's better to have something else to fall back on incase these guys are lost too quickly.