Part 6/9:
Historically, Gondor and Rohan had maintained a long-standing military alliance. This bond existed for over 500 years and had been established in times of peace and conflict alike. Rohan had the right to expect support from Gondor, considering their oath of mutual assistance.
However, it’s crucial to note that Rohan did not formally call for help. The betrayal by Saruman came as a shock to most, including Théoden, who was under the influence of Gríma Wormtongue at a critical moment. Even though there were systems in place to signal for aid, such as the lighting beacons shown in the films, this option was not utilized by Rohan.