According to the author of 1 Chronicles, this part of the story shows how some people hired a big group of chariots and soldiers to help them get ready for a battle. It talks about coming together to fight even if it might not be the right thing to do.
1 Chronicles 19:7: So they hired thirty and two thousand chariots, and the king of Maachah and his people; who came and pitched before Medeba. And the children of Ammon gathered themselves together from their cities, and came to battle.
1 Chronicles 19:18 describes the outcome of the battle where the Syrians fled, contradicting 1 Chronicles 19:7's implication of a prepared and formidable force with the provision of chariots.
1 Chronicles 19:18: But the Syrians fled before Israel; and David slew of the Syrians seven thousand [men which fought in] chariots, and forty thousand footmen, and killed Shophach the captain of the host.