Again, in the same war, the Lamanite prisoners were set to work digging a ditch round about the land, or the city Bountiful; and Moroni caused that they should build a breastwork of timbers upon the inner bank of the ditch; and they cast up dirt out of the ditch against the breastwork of timbers; and thus they did cause the Lamanites to labor until they had encircled the city of Bountiful round about with a strong wall of timbers and earth, to an exceeding height. And this city became an exceeding stronghold ever after. The forces of both races appear to have been composed very largely, if not entirely, of infantry. We have failed to notice any passage that gave a definite assurance that either cavalry or war chariots were used in their campaigns. Like nearly all rude or semi-civilized races, the Lamanites depended on the strength of numbers and brute force for victory in the open field. They massed their troops in solid bodies, and with wild cries rushed to the assault in the hope of bearing down all resistance by their superior numbers, as in almost every war they greatly outnumbered the Nephites. Indeed it is doubtful if even the last-named people used much scientific strategy previous to the days of Moroni; before this time it was a hand-to-hand conflict, wherein the Nephites, though fewer in numbers, had many advantages over their half-naked foes, by reason of superior weapons and defensive armor, and, above all, through the blessing and guidance of the Lord. In the year B. C. 72 the armies of Moroni drove the Lamanites out of that portion of the east wilderness bordering on the land of Zarahemla into their own lands. The northern line or boundary of the latter ran in a straight course from the sea east to the west. The Lamanites having been driven out of those portions of the wilderness north of the dividing line, colonies of Nephites were sent to occupy the country and build cities on their southern border, even to the Atlantic coast. To protect the new settlers, Moroni placed troops all along this line and caused them to erect fortifications for the better defense of the frontier. This fortified line ran from the west sea (the Pacific Ocean) by the head of the river Sidon (the Magdalena) eastward along the northern edge of the wilderness.