Albert Barnes Commentary 1 Chronicles 19:7

"So they hired them thirty and two thousand chariots, and the king of Maacah and his people, who came and encamped before Medeba. And the children of Ammon gathered themselves together from their cities, and came to battle." — 1 Chronicles 19:7 (ASV)

They hired thirty and two thousand chariots - The reading is corrupt. A number as large as 32,000 chariots alone was never brought into battle on any occasion. Compare the numbers in Exodus 14:7, 1 Kings 10:26, and 2 Chronicles 12:3. The largest force an Assyrian king ever speaks of encountering is 3,940.

The words “and horsemen” have probably fallen out of the text after the word “chariots” (compare 1 Chronicles 19:6). The 32,000 would be the number of warriors serving on horseback or in chariots, and this number would agree closely with 2 Samuel 10:6, as the following table shows.