formation formation formation...

Alrighty, a lttle terminology that I use: ranks are for the width and squads for the length eg 3 ranks with squads of 20 is 3 wide by 20 long. 4 ranks are standard for most size groups (platoons) but if you have a lot of men or it's not aesthetically pleasing you can make it wider.

In my mind you want to keep the squads as short as possible in order for it to be relativity easy to hear commands and be able to respond quickly to an emergency. But you can't be to wide or it will be hard to maneuver varying terrain/skinny roads.

With all that in mind, and without pictures of the varying figs. IRL I would have 4 ranks; starting with the Captain of the Guard alone on the most right rank (the Guide's position), followed by the pikemen, archers, crossbowmen, then swordsmen with the horsemen in the back. This is how they would march when traveling from point A to point B.

If you can visualize them getting in battle positions from this formation: the Captain of the Guard is in front to provide direction and morale (we lead from the front). The pikeman spread out to form 2 rows (16 and 17) in a slight arch, the archers and crossbowmen become 2 rows of 10 with a small gap between them and the pikeman. And at a safe distance, the swordsmen stay with the noblemen to protect in case of an attack from the rear and now they have a head start if the army falls (noblemen are cowards ). From the rear (left, right or even both) I would position the calvary so they can swiftly ride onto the battlefield to break the enemy's formations or come to the aid of the soldiers.

This will prevent needles loss of expensive troops, the calvary, and allow the archers to fire their arrows and bolts at the enemy without fear of hand-to-hand combat because the pikemen are in front.

That's my two cents about it but I don't know how well this would work for you. I'm sure Google has some examples of ways armies were positioned back in medieval times.

Have an amphibious day!