Overall Size of Army Companies

The military hierarchy of ranks still used in the twenty-first century was already in place by 1600 [C.E.]. A colonel was assisted by a lieutenant-colonel who commanded in his absence. A major supervised training and administration and could command part of the regiment if it became detached from the rest of it. These three ‘staff officers’ were supplemented by secretaries, chaplains, doctors and a provost in charge of punishment. The same pattern was repeated in each company, with the captain assisted by one or two lieutenants, together with an ensign (called a cornet in the cavalry) responsible for the flag. There was generally also a company scribe, a barber surgeon and a number of non-commissioned officers (NCOs). Together, these senior ranks were known as the prima plana, or ‘first page’, on account of their names being listed before all the others in the muster register. The overall size of foot companies fell from three to four hundred, to two to three hundred over the sixteenth century, with cavalry companies averaging around half these sizes. The number of officers remained the same throughout, reflecting the growing emphasis on hierarchical order and enabling more complicated manoeuvres to be carried out….

The officer-to-men ratio remained relatively static after 1590, because of the technical limitations of the available weapons that required them to be used en masse. Around one officer or NCO could supervise about fifteen soldiers, but captains found it hard to command more than three hundred, as the smoke and noise of battle limited their ability to see what was happening and to shout instructions. This was another reason why infantrymen were packed close together in large formations, since it kept them within the sight of their mounted colonel. The flags and drums would be grouped in the centre and used to signal commands to the rest of the unit. Command problems also placed a premium on experienced men and it was reckoned at least a third of the strength had to be veterans to provide cohesion and sufficient old soldiers to teach new recruits the rudiments of drill and how to survive the rigours of campaign….

— The Thirty Years War, pp. 94-95