Contradiction with Matthew 5:44
Teaches love for enemies, which contradicts the conquering actions mentioned in Joshua.
Matthew 5:44: But I say unto you, Love your enemies, bless them that curse you, do good to them that hate you, and pray for them which despitefully use you, and persecute you;
Contradiction with Isaiah 2:4
Speaks of turning swords into plowshares and not learning war anymore, which contrasts with the military conquest context of Joshua.
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]
Contradiction with Romans 12:17
Advises against repaying evil for evil, challenging the notions of conquest in Joshua.
Romans 12:17: Recompense to no man evil for evil. Provide things honest in the sight of all men.
Contradiction with Matthew 26:52
Jesus saying "all they that take the sword shall perish with the sword" contrasts with the warrior's success narrative in Joshua.
Matthew 26:52: Thinkest thou that I cannot now pray to my Father, and he shall presently give me more than twelve legions of angels?
Contradiction with Proverbs 16:7
States when a man's ways please the Lord, He makes even his enemies to be at peace with him, contrasting the continuous warfare depicted in Joshua.
Proverbs 16:7: When a man's ways please the LORD, he maketh even his enemies to be at peace with him.
Contradiction with Luke 6:27-28
Calls for loving your enemies and blessing those who curse you, opposing the military campaigns described in Joshua.
Luke 6:27-28: But I say unto you which hear, Love your enemies, do good to them which hate you,