When Lehi and his colony left Jerusalem, their leaving was evidently kept secret from the other people in Jerusalem. Mormon tells us concerning Lehi’s departure that “no one knew it save it were himself and those whom he brought out of the land” (3 Nephi 5:20).
Geographical Theory Map: 3 Nephi 3:22-24 Lachoneus Gathers the Nephites Together (17th Year A.S.)
3 Nephi 4:1 -- 5:20 Robbers Take Possession of Nephite Lands (18th -- 25th Year A.S.)
3 Nephi 6:1 -- 8:2 The Nephites Prevail & Return to Their Lands (26th -- 32nd Year A.S.)