Alma 43:52

therefore the armies of Moroni encircled them about; yea, even on both sides of the river; for behold, on the east, were the men of Lehi;

Moroni’s armies surrounded them. They were on both sides of the river. Lehi’s men were on the east.

Moroni’s armies surrounded them on all sides—on both sides of the river. Lehi’s men were on the east.