Do the swordsmen have a different function over spearmen? Certain spear units have a relatively high attack power that matches the high offensive power of the swordsmen.

What's a better offensive unit to use? Nedes Nesamoi or the Argoi? The Hyperaspistai or the Thorakitai? Most of the Germanic Spear Units vs most of the sword units?

If I engage the spear/sword unit with their opposite counterparts, will they be at a disadvantage?