From 1850 to 1855 PD, D'Orville served in the Concept Development Office under Commander Jonas Adcock. Around 1900 PD, D'Orville held the rank of Admiral of the Green and had his flag aboard the superdreadnought HMS King Roger, flagship of the Manticoran Home Fleet. At that time, he led Home Fleet as the aggressors in a series of war games. Admiral D'Orville was embarrassed by Commander Honor Harrington, when her ship, the light cruiser HMS Fearless, "destroyed" King Roger. Consequently, Admiral D'Orville destroyed Fearless in every following game. (HH1, OBS)