Contradiction with Psalm 29:11
Joel 2:5 describes destruction and noise like chariots, while Psalm 29:11 speaks of the Lord blessing His people with peace.
Psalm 29:11: The LORD will give strength unto his people; the LORD will bless his people with peace.
Contradiction with Isaiah 9:7
Joel 2:5 portrays a fearsome army, yet Isaiah 9:7 talks about endless peace on the throne of David.
Isaiah 9:7: Of the increase of [his] government and peace [there shall be] no end, upon the throne of David, and upon his kingdom, to order it, and to establish it with judgment and with justice from henceforth even for ever. The zeal of the LORD of hosts will perform this.
Contradiction with John 14:27
Joel 2:5 presents an image of chaos and battle, whereas John 14:27 promises peace, not as the world gives.
John 14:27: Peace I leave with you, my peace I give unto you: not as the world giveth, give I unto you. Let not your heart be troubled, neither let it be afraid.
Contradiction with Matthew 5:9
Joel 2:5 involves turmoil, but Matthew 5:9 blesses peacemakers.
Matthew 5:9: Blessed [are] the peacemakers: for they shall be called the children of God.
Contradiction with Micah 4:3
Joel 2:5 is about the clamor of war, while Micah 4:3 envisions a time without war.
Micah 4:3: And he shall judge among many people, and rebuke strong nations afar off; and they shall beat their swords into plowshares, and their spears into pruninghooks: nation shall not lift up a sword against nation, neither shall they learn war any more. [pruninghooks: or, scythes]