Alma 3:1 - 3:5
Alma 3:1 And it came to pass that the Nephites who were not slain by the weapons of war, after having buried those who had been slain—now the number of the slain were not numbered, because of the greatness of their number—after they had finished burying their dead they all returned to their lands, and to their houses, and their wives, and their children.
The death toll from these battles among the Nephites was great; so great that they were not counted. After the bodies were buried, the members of the army return to their homes and families.
Alma 3:2 Now many women and children had been slain with the sword, and also many of their flocks and their herds; and also many of their fields of grain were destroyed, for they were trodden down by the hosts of men.
Not only were there causalities in the army but among the civilian population as well. Many women and children as well as the Nephite livestock were slaughtered by the Lamanites. Much of the fields of grains were destroyed as the large Lamanite army moved through the country side.
Alma 3:3 And now as many of the Lamanites and the Amlicites who had been slain upon the bank of the river Sidon were cast into the waters of Sidon; and behold their bones are in the depths of the sea, and they are many.
The Nephites did not bury the Lamanite or Amlicites dead, but instead through their bodies into the river Sidon where they were carried out to sea and are in the depths thereof.
Alma 3:4 And the Amlicites were distinguished from the Nephites, for they had marked themselves with red in their foreheads after the manner of the Lamanites; nevertheless they had not shorn their heads like unto the Lamanites.
An interesting side note: the Amlicites marked themselves in the same manner as the Lamanites, that is, with red on their foreheads. The Lamanites normally shaved their heads along with the red markings, but the Amlicites did not.
Alma 3:5 Now the heads of the Lamanites were shorn; and they were naked, save it were skin which was girded about their loins, and also their armor, which was girded about them, and their bows, and their arrows, and their stones, and their slings, and so forth.
The normal Lamanite warrior had shaved their heads and were naked for the most part. They wore a piece of animal skin to cover their private parts with some armor. They're weapons of choice were bows and arrows, stones to be used with their slings and whatever weapons they could carry.