Contradiction with Isaiah 2:4
Joel 2:7 describes a warlike approach, while Isaiah 2:4 speaks of beating swords into plowshares, symbolizing peace.
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 12:18
Joel 2:7 depicts a controlled military force, whereas Romans 12:18 encourages living peaceably with all.
Romans 12:18: If it be possible, as much as lieth in you, live peaceably with all men.
Contradiction with Matthew 5:9
Joel 2:7 highlights disciplined warriors, while Matthew 5:9 calls blessed the peacemakers, contrasting aggression with peacebuilding.
Matthew 5:9: Blessed [are] the peacemakers: for they shall be called the children of God.
Contradiction with Exodus 14:14
Joel 2:7 shows active military preparation, yet Exodus 14:14 tells that the Lord shall fight while people hold their peace.
Exodus 14:14: The LORD shall fight for you, and ye shall hold your peace.
Contradiction with James 3:17
Joel 2:7 depicts warriors executing strict commands, whereas James 3:17 describes wisdom from above as peaceable and gentle.
James 3:17: But the wisdom that is from above is first pure, then peaceable, gentle, [and] easy to be intreated, full of mercy and good fruits, without partiality, and without hypocrisy. [partiality: or, wrangling]