In Dragonfly Falling, Collegium returning fire on the first night of the siege and destroying over three-quarters of the Vekken siege artillery is most definitely a CMOA. The entire volley was fired blind, aimed using only the calculations that Collegium's mathematicians had made earlier that day.Awesomeness by Analysis does not do it justice!
Tisamon's amazing death/ assassination of the Emperor in Salute the Dark.
Fridge Brilliance: Most of the things that the Spider-kinden Lord-Martial Teornis says to the Wasps says to any foreigner can be interpreted in many different ways that make sense in different context later on. Pay attention to what he says to the Wasps about greeting them with closed fists: is he acknowledging their cultural differences and using their signal of peace to display it, or is he underhandedly insulting them and declaring war?
Tear Jerker: In Heirs of the BladeTynisa's anguished words to the spirit of Tisamon. "Where is the man who was Stenwold's friend. and who loved my mother? Where is my father!", her words to Salma's spirit is one as well