Alma 53

 
1 And it came to pass that they did set guards over the prisoners of the Lamanites, and did compel them to go forth and bury their dead, yea, and also the dead of the Nephites who were slain; and Moroni placed men over them to guard them while they should perform their labors.
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2 And Moroni went to the city of Mulek with Lehi, and took command of the city and gave it unto Lehi. Now behold, this Lehi was a man who had been with Moroni in the more part of all his battles; and he was a man like unto Moroni, and they rejoiced in each other's safety; yea, they were beloved by each other, and also beloved by all the people of Nephi.
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3 And it came to pass that after the Lamanites had finished burying their dead and also the dead of the Nephites, they were marched back into the land Bountiful; and Teancum, by the orders of Moroni, caused that they should commence laboring in digging a ditch round about the land, or the city, Bountiful.
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4 And he caused that they should build a breastwork of timbers upon the inner bank of the ditch; and they cast up dirt out of the ditch against the breastwork of timbers; and thus they did cause the Lamanites to labor until they had encircled the city of Bountiful round about with a strong wall of timbers and earth, to an exceeding height.
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5 And this city became an exceeding stronghold ever after; and in this city they did guard the prisoners of the Lamanites; yea, even within a wall which they had caused them to build with their own hands. Now Moroni was compelled to cause the Lamanites to labor, because it was easy to guard them while at their labor; and he desired all his forces when he should make an attack upon the Lamanites.
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6 And it came to pass that Moroni had thus gained a victory over one of the greatest of the armies of the Lamanites, and had obtained possession of the city of Mulek, which was one of the strongest holds of the Lamanites in the land of Nephi; and thus he had also built a stronghold to retain his prisoners.
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7 And it came to pass that he did no more attempt a battle with the Lamanites in that year, but he did employ his men in preparing for war, yea, and in making fortifications to guard against the Lamanites, yea, and also delivering their women and their children from famine and affliction, and providing food for their armies.
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This verse is a bit of an inversion of a KJV Old Testament verse. Compare this verse with "delivering their women and their children from famine and affliction" to Jeremiah 18:21 with "deliver up their children to the famine,... and let their wives be bereaved of their children". Note that of the variations of famine+affliction+children+wives in the KJV bible, this verse is the closest match.

8 And now it came to pass that the armies of the Lamanites, on the west sea, south, while in the absence of Moroni on account of some intrigue amongst the Nephites, which caused dissensions amongst them, had gained some ground over the Nephites, yea, insomuch that they had obtained possession of a number of their cities in that part of the land.
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9 And thus because of iniquity amongst themselves, yea, because of dissensions and intrigue among themselves they were placed in the most dangerous circumstances.
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10 And now behold, I have somewhat to say concerning the people of Ammon, who, in the beginning, were Lamanites; but by Ammon and his brethren, or rather by the power and word of God, they had been converted unto the Lord; and they had been brought down into the land of Zarahemla, and had ever since been protected by the Nephites.
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11 And because of their oath they had been kept from taking up arms against their brethren; for they had taken an oath that they never would shed blood more; and according to their oath they would have perished; yea, they would have suffered themselves to have fallen into the hands of their brethren, had it not been for the pity and the exceeding love which Ammon and his brethren had had for them.
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12 And for this cause they were brought down into the land of Zarahemla; and they ever had been protected by the Nephites.
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13 But it came to pass that when they saw the danger, and the many afflictions and tribulations which the Nephites bore for them, they were moved with compassion and were desirous to take up arms in the defence of their country.
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Compare this verse with "when they saw the danger,... they were moved with compassion" to Matthew 9:36 with "But when he saw the multitudes, he was moved with compassion on them". Note that the phrase "moved with compassion" is only found in 6 instances within the KJV bible, all within the Gospels of Matthew and Mark, but the verse in Matthew 9 is the closest match.

14 But behold, as they were about to take their weapons of war, they were overpowered by the persuasions of Helaman and his brethren, for they were about to break the oath which they had made.
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15 And Helaman feared lest by so doing they should lose their souls; therefore all those who had entered into this covenant were compelled to behold their brethren wade through their afflictions, in their dangerous circumstances at this time.
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16 But behold, it came to pass they had many sons, who had not entered into a covenant that they would not take their weapons of war to defend themselves against their enemies; therefore they did assemble themselves together at this time, as many as were able to take up arms, and they called themselves Nephites.
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17 And they entered into a covenant to fight for the liberty of the Nephites, yea, to protect the land unto the laying down of their lives; yea, even they covenanted that they never would give up their liberty, but they would fight in all cases to protect the Nephites and themselves from bondage.
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18 Now behold, there were two thousand of those young men, who entered into this covenant and took their weapons of war to defend their country.
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19 And now behold, as they never had hitherto been a disadvantage to the Nephites, they became now at this period of time also a great support; for they took their weapons of war, and they would that Helaman should be their leader.
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20 And they were all young men, and they were exceedingly valiant for courage, and also for strength and activity; but behold, this was not all--they were men who were true at all times in whatsoever thing they were entrusted.
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21 Yea, they were men of truth and soberness, for they had been taught to keep the commandments of God and to walk uprightly before him.
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Compare this verse with "they were men of truth and soberness" to Acts 26:25 with "speak forth the words of truth and soberness". Note the KJV verse in Acts is the only one that contains any combination of truth+soberness.

22 And now it came to pass that Helaman did march at the head of his two thousand stripling soldiers, to the support of the people in the borders of the land on the south by the west sea.
Internally inconsistent - BoM
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The people of Ammon were Lamanites converted to the gospel taught by Ammon. These Ammonites had covenanted never to take up weapons against anyone again (verse 11 and Alma 24:18). But starting in Alma 53:13, the Ammonites are concerned for the Nephites who are protecting them in war, so the Ammonites considered taking up weapons to wage war for the Nephites. Of course, the Nephites are concerned that the Ammonites might lose their souls if they break the covenant, so they figure out a work-around. The Ammonite sons who were too young to have made the covenant could wage war without jeopardizing their souls. Alma 53:22-23 tells us Helaman first marched with these young men (2,000 stripling soldiers) to battle at the end of the 28th year of the reign of the judges. This conflicts with Alma 56:7-9 that tells us Helaman marched with these 2,000 young warriors in the 26th year.

-a-bom
23 And thus ended the twenty and eighth year of the reign of the judges over the people of Nephi.
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The people of Ammon were Lamanites converted to the gospel taught by Ammon. These Ammonites had covenanted never to take up weapons against anyone again (verse 11 and Alma 24:18). But starting in Alma 53:13, the Ammonites are concerned for the Nephites who are protecting them in war, so the Ammonites considered taking up weapons to wage war for the Nephites. Of course, the Nephites are concerned that the Ammonites might lose their souls if they break the covenant, so they figure out a work-around. The Ammonite sons who were too young to have made the covenant could wage war without jeopardizing their souls. Alma 53:22-23 tells us Helaman first marched with these young men (2,000 stripling soldiers) to battle at the end of the 28th year of the reign of the judges. This conflicts with Alma 56:7-9 that tells us Helaman marched with these 2,000 young warriors in the 26th year.