The editors for the 1920 LDS edition changed the preposition here from to to at. The critical text will follow the original preposition to. For a complete discussion of this 1920 change, also implemented elsewhere in the text, see under 1 Nephi 17:14.
Summary: Restore in Alma 52:18 the original preposition to in “Moroni did arrive with his army to the land of Bountiful”.