Second-in-command

The Prince of Orange served as second-in-command of the Allied army under Arthur Wellesley, Duke of Wellington. (PROSE: World Game)

During the Last Great Time War, the Dalek Time Strategist had the coveted rank of second-in-command of the Dalek Empire, serving as an advisor to the Dalek Emperor. (AUDIO: Restoration of the Daleks, Temmosus)