Contradiction with Proverbs 3:5
Joshua 8:9 depicts Joshua relying on his own strategy after receiving divine guidance, while Proverbs 3:5 advises complete trust in the Lord and not leaning on one's understanding.
Proverbs 3:5: Trust in the LORD with all thine heart; and lean not unto thine own understanding.
Contradiction with Matthew 5:44
Joshua 8:9 involves an ambush for conquest, whereas Matthew 5:44 teaches love for enemies and prayers for those who persecute you.
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 Romans 12:19
Joshua 8:9 involves planning for battle, but Romans 12:19 urges against seeking vengeance, leaving it to God's wrath.
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 Psalm 46:10
Joshua 8:9 involves proactive military action, whereas Psalm 46:10 instructs to "be still" and recognize God's sovereignty.
Psalm 46:10: Be still, and know that I [am] God: I will be exalted among the heathen, I will be exalted in the earth.
Contradiction with Luke 6:27
Joshua 8:9 deals with planning an attack, but Luke 6:27 commands to love your enemies and do good to those who hate you.
Luke 6:27: But I say unto you which hear, Love your enemies, do good to them which hate you,