I can't log in to the forum to answer them, as I don't have a UK login. However, if someone from that forum does read this page, please note that a US Army lieutenant colonel by the name of Christopher appropriately put me and another captain in our place. He identified the author of the quote as Sir William Francis Butler, writing in his book "Charles George Gordon" (p. 85).
I shouldn't be too hard on myself, though. Even the House Armed Services Comittee misidentified this one.