Final answer:
The run to Dyea Canon was extremely difficult due to the treacherous road conditions, psychological stress, and the physical exhaustion of both characters and horses depicted in intense, survival-driven scenarios.
Step-by-step explanation:
The run to Dyea Canon was notably difficult due to a combination of harsh environmental conditions and the intensity of the situation faced by the characters. The road was described as being incredibly rough, with heavy furrows and mud-holes that made traversal nearly impossible. The characters experienced nervous apprehension and panic, indicating the psychological strain in addition to the physical challenges of the journey.
In another instance, the difficulty of the run is highlighted through the sheer exhaustion of the characters and their animals, dealing with blood, froth, and injuries. It's a depiction of a struggle for survival against the backdrop of a harsh landscape. The urgency and desperation of the situation are palpable as they push forward despite the overwhelming odds.
The narrative emphasizes the characters' fight against the harshness of nature, life and death situations, and the fear induced by their circumstances. These excerpts provide a vivid picture of the numerous challenges that made the run to Dyea Canon an arduous journey.