The 1840 edition accidentally dropped the perfect auxiliary had here in Alma 52:12. This change was not intentional because the had was retained for the two following conjoined predicates (“and had gathered … and had marched”). The 1908 RLDS edition restored the had to the RLDS text.
Summary: Maintain the three repetitions of the past-tense perfect auxiliary had in Alma 52:12: “had departed … and had made known … and had gathered … and had marched”.