In is passage, Henry is facing a part of himself that he knew nothing about. What is this characteristic?

Henry's romantic ideals of war begin to vanish as battle approaches. Henry continues to think as the regiment marches. He feels threatened by the landscape. He sees it as full of fierce-eyed enemies. All of a sudden, he is full of distrust of his commanders. He is sure they have led the men into a trap. He must get out; he must be the sole eyes and ears aware of this danger. Henry feels fear and adrenalin that is more chaotic than natural.