The new (to me) one is from the Midwest Book Review (scroll down to their Civil War Shelf) -- to whom a tip of the hat. It is anonymous and very short:
"With a special appeal and relevance to readers with an interest in the abolitionist movement to end slavery in Kansas and Missouri, the American Civil War in general, and the role of Union Colonel James Montgomery and his African-American troops in particular, 'James Montgomery: Abolitionist Warrior' is as informatively detailed [as] it is inherently fascinating. ... an extraordinary and welcome contribution to the growing library of American Civil War histories and biographies."
A yet newer review is of a considerably older book, the Granger biography which was published in 2013 and reissued in paperback last year. It's by Meg Groeling, to whom go my thanks for another positive review, and appears in the January 2023 print edition of Civil War News, but does not seem to be online yet. (They reviewed my Montgomery book last October.)