Code Geass - Queen - Vol. 1 Ch. 3 - Woe of a Commander-in-Chief

[MangaDex]

 

[Kaarme]

His brain was his primary strength, even more importantly than the geass power.

 

[BakedBanana]

It's been awhile since I've watched Code Geass but I don't remember Lelouch being that bad with a Knightmare, usually his defeat was because of his bad luck of who he faced (like Suzaku).