Contradiction with John 18:36
This verse mentions Jesus's kingdom not being of this world, which contrasts with the idea of earthly military allegiance and leadership found in the Chronicles.
John 18:36: Jesus answered, My kingdom is not of this world: if my kingdom were of this world, then would my servants fight, that I should not be delivered to the Jews: but now is my kingdom not from hence.
Contradiction with Matthew 5:9
"Blessed are the peacemakers," contradicts the context of gathering warriors for battle as seen in 1 Chronicles 12.
Matthew 5:9: Blessed [are] the peacemakers: for they shall be called the children of God.