I am making the ideal Calradian army, it consists of:
15 Swadian knights
15 Nord huscarls
30 Rhodok sergeants
15 Swadian sergeants or vaegir guards.
15 Vaegir Marksmen.
the rest of your army is the reserve.
What I do is, Divide the infantry by kind in 3 separate units, whit nords on the left flank, Rhodoks on the center and vaegirs/swadians on the right, the Rhodoks are better in holding the enemy and are slower than nords plus they have big shields, ideal for the beat taking part of the army, if it was possible I'd put nords on both flanks, but since you cant divide the same unit kind in 2, I had to go whit other unit type, you should also put your cavalry behind the right flank, and the archers in a hill behind your lines, and the reserves behind the rhodok in case the enemy cavalry manages to charge tough, the battle plan is simple, wen the enemy clashes whit your rhodoks, let the nords loose to do what they do best, move your swadian/vaegir line in a _/ shaped form whit the rhodoks to hold the enemy's left wing packed, then maneuver whit the cavalry and charge home.
the reserves exist to help any section that may be collapsing, it normally is the nord's left flank or the Rhodokian center, the nords tend to kill a lot but since the lack of a proper line they usually get killed too (like killing 50 and dieing 10) this is where you put your reserves, which should be composed of mid/low tier troops and things you don't use, like vaegirs in case of a swadian flank and vice versa.