R = reserve and runner K = command L = long weapon (spears / daneaxes) O = shield-people (axes / one-handed spears / swords)
blue = regular group gray = (sub)command
Things this formation can achieve
faster group movement speed
easy way of adressing the cohorts: compact groups and a clearly distinguishable command in front of it
easily keep up a rearguard during open movement
limited field of operation for the reserves
Things to keep in mind
During the preparation time each cohort's commander should get his commands from the army's commander while an experienced fighter organizes the cohort. This can save a considerable amount of time in trainings.
Shortly before enganging the opponent the commander moves to a position next to, within or behind the group.