Alma 43:24 24 And it came to pass that the word of the Lord came unto Alma, and Alma informed the messengers of Moroni, that the armies of the Lamanites were marching round about in the wilderness, that they might come over into the land of Manti, that they might commence an attack upon the weaker part of the people.  And those messengers went and delivered the message unto Moroni.

Alma 43:25 25 Now Moroni, leaving a part of his army in the land of
Jershon, lest by any means a part of the Lamanites should come
into that land and take possession of the city, took the
remaining part of his army and marched over into the land of
Manti.

Alma 43:26 26 And he caused that all the people in that quarter of the land
should gather themselves together to battle against the
Lamanites, to defend their lands and their country, their rights
and their liberties; therefore they were prepared against the
time of the coming of the Lamanites.

Alma 43:27 27 And it came to pass that Moroni caused that his army should
be secreted in the valley which was near the bank of the river
Sidon, which was on the west of the river Sidon in the
wilderness.

Alma 43:28 28 And Moroni placed spies round about, that he might know when
the camp of the Lamanites should come.

Alma 43:29 29 And now, as Moroni knew the intention of the Lamanites, that
it was their intention to destroy their brethren, or to subject
them and bring them into bondage that they might establish a
kingdom unto themselves over all the land;

Alma 43:30 30 And he also knowing that it was the only desire of the
Nephites to preserve their lands, and their liberty, and their
church, therefore he thought it no sin that he should defend them
by stratagem; therefore, he found by his spies which course the
Lamanites were to take.

Alma 43:31 31 Therefore, he divided his army and brought a part over into
the valley, and concealed them on the east, and on the south of
the hill Riplah;

Alma 43:32 32 And the remainder he concealed in the west valley, on the
west of the river Sidon, and so down into the borders of the land
Manti.

Alma 43:33 33 And thus having placed his army according to his desire, he
was prepared to meet them.

Alma 43:34 34 And it came to pass that the Lamanites came up on the north
of the hill, where a part of the army of Moroni was concealed.

Alma 43:35 35 And as the Lamanites had passed the hill Riplah, and came into the valley, and began to cross the river Sidon, the army which was concealed on the south of the hill, which was led by a man whose name was Lehi, and he led his army forth and encircled the Lamanites about on the east in their rear.

Alma 43:36 36 And it came to pass that the Lamanites, when they saw the
Nephites coming upon them in their rear, turned them about and
began to contend with the army of Lehi.