Alma 22:1 And now it came to pass that Moroni did not stop making preparations for war, or to defend his people against the Lamanites; for he caused that his armies should commence in the commencement of the twentieth year of the reign of the Judges, that they should commence in digging up heaps of earth round about all the cities, throughout all the land which was possessed by the Nephites;
Alma 22:2 And upon the top of these ridges of earth he caused that there should be
timbers; yea, works of
timbers built up to the height of a man, round about the cities.
Alma 24:54 And Teancum, by the orders of Moroni, caused that they should commence laboring in digging a ditch round about the land, or the city Bountiful;