Unit lines are groups of units that upgrade in a certain order (e.g. in the Militia Line, the Freeman upgrades to the Town Militia, which ups further).
“The Knightly Infantry consists of heavily armed soldiers taking up one and a half population...Knightly Infantry
“The Spearman Line of units groups the basic anticavalry units. It consists of the Spearman and...Spearman Line
“The Scout Line of Light Cavalry consists of lightly armed, but very fast riders. Sixteen of the...Light Cavalry Line
“The Knightly Cavalry consists of heavily armed mounted units taking up two population slots. The...Knightly Cavalry
“The Scout Line of Militia Lancers consists of lightly armed Lancer units. Though having less...Militia Lancer Line
“The Lancer Line is a line of medium anti-cavalry units taking up one and a half population...Lancer Line
“(Not to be confused with Archers.) The Archer Line includes the basic ranged units of a...Archer Line