Not surprising at all.  Darius is obviously more experienced at small unit tactics (the tactics of the squad, not the army) because that's all he ever had to do before this.  He was never a military commander, after all, just a member of a scout squad.  (and a failed one at that.)<br/><br/>So being good at dealing at problems that involve him and a small group makes sense for him, while commanding a couple hundred men or more in a situation he can't see with his own eyes?  Yeah, that's all book knowledge for him, and he certainly won't be expert at it yet.