C. F. Keil and Franz Delitzsch on 2 Chronicles 17:14-16

2Ch 17:14-16

The men fit for war passed in review according to their fathers'-houses. The male population of Judah fell into three divisions, that of Benjamin into two. The prince Adnah held the first place among the generals, with 300,000 men of Judah. ידו על, at his hand, i.e., with and under him, Jehohanan had the command of 280,000 men, and Amasiah over 200,000. השׂר is a contraction for אלפים שׂר. For what special reason it is so honourably recorded of Amasiah that he had willingly offered himself to the Lord (cf. for התנדּב, Jdg 5:9) has not been communicated.