Queensland State Archives posted a photo:
Lytton Hill was the only significant hill in the one square mile Fort Lytton complex, giving it enormous defensive significance. It is located about three-quarters of a mile (1200m) east of the colonial fort. In the mid-1880s a redoubt (mini-fort) was constructed on the hill to serve as a lookout and as a base for the infantry and field artillery units that were needed to protect Fort Lytton from an attack by land. The redoubt was connected to Fort Lytton by telegraph, no doubt backed up by more traditional signalling means such as semaphore.
Lytton Hill was able to observe and report ship movements in Moreton Bay, and land movements of attacking forces. In the Second World War, Lytton Hill accommodated an army signals station and a Royal Australian Airforce radar station. At various times Lytton Hill was also used for civilian applications such as for