eral cohorts in a hollow square. This latter might have been made circular, to resist attack at the angles. A legion could form the square by placing the first, second, and third cohorts in front, the eighth, ninth, and tenth in the rear, the fifth and sixth in the right, and the fourth and seventh on the left. There would then be a front of 360 ft. and a flank of 320. The inner hollow space would be 280 ft. long and 240 ft. broad, thus making 67,200 sq. ft. This would contain more than 1000 pack-animals.
§ 71. Under some circumstances we read also of a quadruple line of battle. This was designed to meet a flank attack. Some cohorts were taken from the rear line (tertia acies) and placed in line on the right (or left) flank at right angles with the main line of battle.
C. III, 89.
THE ORDER OF MARCH.
The order of march is developed from the battle array So we must begin with the cohort.
§ 72. The line of march (agmen) of the cohort was one of two, — column of maniples and column of centuries.
§ 73. The column of maniples (manipulatim) was formed from order of battle by merely facing to the right (or left). Thus the maniples, it will be seen, were in column (Fig. 20), and the centuries in each maniple were side by side. If the cohort was faced to the right, the order was pilani, principes, hastati. As the depth of the cohort in line of battle was 40 ft., of course the column of maniples was 40 ft. wide. But this was a loose order. Allowing 3 ft. to each man, the column could easily have been made only