I just happen to have an essay on this topic here.
"Everyone believe as a proper Swadian, the way to go is with a lance, sword and morningstar, charging atop a fine well-bred barded warhorse. But you are a Swadchesmarine, the elite infantry of the Swadian Empire. You hail from the coasts of Swadia, from Asgad, Balanli and Elberl, you've trained your whole life in the art of holding the line. You are the best line infantry the world has to offer, and your equipment reflect it.
You shun the morningstars, the bastard swords and the great lances, weapons traditionally associated with the knights of the realm. No, you are born commoners, and your spirit and discipline supersedes the need for a fine mount or a long spear. You hold the line with your heavy crossbows, firing withering volleys at any and all incoming opposition. To defend yourself in close-bloody quarter as your foes close in, you turn to your trusted short sword and shield while your comrades from both sides bombard your foes in the back with their crossbows. Such is the simplicity of your armaments that your foes would look down on them and charge headlong into your line of fire like butterfiles to the torch. Such is the folly of those whose brain would be pierced by a solid bolt.
In sieges, your equipment and your mastery over it shines like no other. Holding your line before the enemy walls, you tear through the defenders, armor and shields alike, with your hails of missiles. A wise commander know that mighty as you are, your strength is in your discipline and nerve to keep up the barrage under fire, not to charge up the ladders, and will use you as such. Unlike the proud knights and the foolhardy sergeants, you know that sometimes the best way to win the day is to withdraw rather than to persist.
Let these words guide you. Let the badge of the Swadchesmarines shine on your haubergeons' shoulders. Let discipline and courage be your watchword. Let your crossbow, sword and shield be the scourge of all those who would oppose the Swadian cause."
In other words: Arming sword, heater shield and the biggest crossbow I can lay my hands on.
Disclaimer: I hold no responsibility for any terrible defeat against Khergits you may encounter for employing an all-Swadian Sharpshooter team. Effing Lancer spams.