Another one from the Warhammer 40K line, this time from the Grey Knights novel. Justicar Alaric and a small team of his Grey Knights were about to face one of the most terrible daemons in the galaxy. In fact, it was one so terrible that it once massacred over 300 Grey Knights in one battle. To inspire his men, he gave this awesome speech:
"We do not know what our chances of survival are, so we fight as if they were zero. We do not know what we are facing, so we fight as if it was the dark gods themselves. No one will remember us now and we may never be buried beneath Titan, so we will build our own memorial here. The Chapter might lose us and the Imperium might never know we existed, but the Enemy - the Enemy will know. The Enemy will remember. We will hurt it so badly that it will never forget us until the stars burn out and the Emperor vanquishes it at the end of time. When Chaos is dying, its last thought will be of us. That is our memorial -carved into the heart of Chaos. We cannot lose, Grey Knights. We have already won."
- The Sisters of Battle, arguably, have a CMoA in this book:
Alaric: "I'm just glad they're on OUR side."