Note 65 — THE FORMAL TACTICS OF INFANTRY.
Walter Krueger translation
The number of ranks is intimately related to the rate of fire of the infantry weapon. During the days of slow loading, the necessity of keeping at least a part of the rifles at all times ready for firing led the Imperialists in the Thirty Years’ war (loading was executed by 90 motions) to form their musketeers into sixteen ranks, while Gustavus Adolphus was able to form his infantry into six ranks owing to the greater loading facility of their rifles. In the Seven Years’ war the Prussian infantry was formed in three, that of the Austrians in four ranks, the fourth rank serving as a reserve. The first rank fired kneeling. The British infantry was the first to adopt the two rank formation for fire action, forming into four ranks for shock action and frequently for warding off cavalry attacks. Emperor Napoleon considered a third rank useless for fire and shock action and initiated the double rank formation on the eve of the battle of Leipzig. In 1888 the Prussian infantry—the last to do so—gave up the three rank formation which had long since lost its importance in battle and which was retained side by side with the double rank formation for purposes of parade only.