Contradiction with Matthew 5:39
Encourages turning the other cheek, contradicting the act of battle.
Matthew 5:39: But I say unto you, That ye resist not evil: but whosoever shall smite thee on thy right cheek, turn to him the other also.
Contradiction with Exodus 20:13
Prohibits killing, in contrast to the battle context of 2 Samuel 10:13.
Exodus 20:13: Thou shalt not kill.
Contradiction with Romans 12:19
Advises against taking revenge, contradicting actions in warfare.
Romans 12:19: Dearly beloved, avenge not yourselves, but [rather] give place unto wrath: for it is written, Vengeance [is] mine; I will repay, saith the Lord.
Contradiction with Proverbs 20:22
Instructs not to say "I will recompense evil", conflicting with waging war.
Proverbs 20:22: Say not thou, I will recompense evil; [but] wait on the LORD, and he shall save thee.
Contradiction with Isaiah 2:4
Speaks of beating swords into plowshares, opposing the concept of battle.
Isaiah 2:4: And he shall judge among the nations, and shall rebuke many people: and they shall beat their swords into plowshares, and their spears into pruninghooks: nation shall not lift up sword against nation, neither shall they learn war any more. [pruninghooks: or, scythes]