Charles Ellicott Commentary 2 Chronicles 1:14

"And Solomon gathered chariots and horsemen: and he had a thousand and four hundred chariots, and twelve thousand horsemen, that he placed in the chariot cities, and with the king at Jerusalem." — 2 Chronicles 1:14 (ASV)

And Solomon gathered chariots and horsemen. —Word for word as in 1 Kings 10:26; see the Notes there.

Which he placed. — And he placed, or bestowed them (wayyanhîhem) (2 Chronicles 9:25). Kings 50100 reads, “and he brought them into the chariot cities” (wayyanhem). The difference turns on the pointing only, and the versions there support our text; Septuagint, “he put”; Vulgate, disposuit; Targum, ’ashrinnûn, “he lodged them”; Syriac, “he left them.”

The chariots (rekeb; see 1 Chronicles 18:4; 1 Chronicles 19:6) and horsemen were, of course, military. The “chariot cities” probably lay in the south towards Egypt. The Simeonite Beth-marcaboth (house of chariots), and Hazar-susim (court of horses) may have been included among them (see 1 Chronicles 4:31).