Charles Ellicott Commentary 2 Chronicles 25:6

"He hired also a hundred thousand mighty men of valor out of Israel for a hundred talents of silver." — 2 Chronicles 25:6 (ASV)

He hired also ... out of Israel — that is, from the northern kingdom. The number has probably suffered in transmission. Thenius pronounces the fact historical, although not recorded in Kings.

An hundred talents of silver. — Worth about £40,000 of our money, reckoning £400 to the talent. What such a sum would represent in the days of Amaziah cannot be determined with certainty.