Just done a little bit of unit comparing:

Spearmen vs Swiss Armoured Pikemen. I did 3 tests, all on flat ground (Agincourt).

Attacker:
1 unit of spear men: V4 W0 A1

Defender:
1 unit swiss armoured pikemen: V0 W0 A0

Attacker's army cost less than defenders by 45 florins.

Attacker won all 3 battles.

Draw your own conclusions...

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It's getting warm in here...that must be one hell of an INFERNO!