Contradiction with 2 Samuel 24:9
This verse provides a different number for the count of valiant men, which contradicts the numbers given in 1 Chronicles 7:9.
2 Samuel 24:9: And Joab gave up the sum of the number of the people unto the king: and there were in Israel eight hundred thousand valiant men that drew the sword; and the men of Judah [were] five hundred thousand men.
Contradiction with 1 Kings 20:27
This verse depicts the Israelites as 'little flocks of goats' compared to the Syrians, contradicting the large, organized, and numerous assembly of fighting men in 1 Chronicles 7:9.
1 Kings 20:27: And the children of Israel were numbered, and were all present, and went against them: and the children of Israel pitched before them like two little flocks of kids; but the Syrians filled the country. [were all...: or, were nourished]
Contradiction with Judges 7:2
God tells Gideon that he has too many men for battle, which contradicts the emphasis on large numbers in 1 Chronicles 7:9.
Judges 7:2: And the LORD said unto Gideon, The people that [are] with thee [are] too many for me to give the Midianites into their hands, lest Israel vaunt themselves against me, saying, Mine own hand hath saved me.