1 Nephi 11:34. Multitudes Gathered for War
The wording “the multitudes of the earth” that “were gathered together to fight” (1 Nephi 11:34) was taken from in Revelation 19:19, where it is “the kings of the earth” which were “gathered together to make war.” Since the New Testament was unavailable to the Nephites, who left Jerusalem six centuries before Christ’s birth, we must attribute the borrowing to Joseph Smith.
The Hebrew word “army” (usually rendered “host” in KJV) derives from the verb meaning “assemble, gather,” and armies always “gather together to fight” (twice in the Old Testament) or “gather together to war” (three times in the Old Testament). So this is the normal Hebrew way of describing preparations for war and should not be counted as a borrowing from the New Testament.