 In 1943 a similar battery was built at Rous, on the east side of Moreton Island.The major access route into the Brisbane River was the Northwest Channel, which ran from near Caloundra across the bay in a southeast direction (east of Bribie Island and towards Moreton Island) and then southwest towards the mouth of the Brisbane River, forming a Z-shaped route.This dictated the ideal positions for coastal artillery batteries, with the most effective sites for guns being the closest points to the channel bends.