This sudden betrayal from the dwarves is a huge blow to the Narnians, who were counting on the aid of the horses. Earlier in the novel, Tirian and Jewel killed two Calormenes for daring to strike a horse. Here, the dwarves have committed a far greater wrongdoing, which enrages the Narnians. However, Tirian knows he needs the dwarves as allies if he hopes to win the battle. Without them, all hope seems lost.