What is Flash's opinion of Brown in the novel, Flashman & the Angel of the Lord: From the Flashman Papers, 1858-59?

While legend calls Brown the Angel of the Lord, Flashy finds him an ordinary, kindly chap with bright, fierce eyes who before they had met had killed many people. Flashy contemplates how Brown certainly is a saint as the poets have declared, but also a brute as biographers have shown.