OT: If I Ever Became An Evil Overlord

[Alneyan]

You would want to gently tell your not so trusted advisor to look up for Achilles in your global database, as it might have been interesting for Troy to hear about his weakness a bit earlier.

Or more generally speaking, when you face someone apparently invincible, wisdom dictates to seek his vulnerability rather than send half your army to its doom. (The other half being used to divert the enemy while you run away, obviously)