Xenophon, Cyropaedia
Walter Miller, Ed.

And once he saw another captain leading his¹ company up from the river left about in single file and ordering when he thought it was proper, the second division and then the third and the fourth to advance to the front; and when the lieutenants were in a row in front, he ordered each division to march up in double file. Thus the sergeants came to stand on the front line. Again, when he thought proper, he ordered the divisions to line up four abreast; in this formation, then, the corporals in their turn came to stand four abreast in each division; and when they arrived at the doors of the tent, he commanded them to fall into single file again, and in this order he led the first division into the tent; the second he ordered to fall in line behind the first and follow, and, giving orders in like manner to the third and fourth, he led them inside. And when he had thus led them all in, he gave them their places at dinner in the order in which they came in. Pleased with him for his gentleness of discipline and for his painstaking, Cyrus invited this company also with its captain to dinner.

With another doubling up of ranks, they assume a front of sixteen men and a depth of six:

Finally in these groups of six each, they are led, single file, in to dinner.