Fort Lytton is a heritage-listed 19th century coastal fort in the suburb of Lytton in Brisbane, Queensland, Australia. The name “Fort Lytton” is also used to describe the one square mile (259 hectares) military base that surrounded the fort. Fort Lytton was built in 1880-1882, and operated until 1965. The historic fort is now contained in Fort Lytton National Park. The park is open to the public on most Sundays and public holidays. Guided tours are provided by Fort Lytton Historical Association, a non-profit volunteer organisation.
Fort Lytton was built in 1880-1882 in response to a fear that a foreign colonial power such as Russia or France might launch a naval attack on Brisbane or its port, both of which were located along the banks of the Brisbane River. The fort was designed by Lieutenant-Colonel Peter Scratchley. It was located at the mouth of the Brisbane river, and was designed to deny enemy vessels access to the river. This was initially achieved by a remote-controlled minefield across the mouth of the river, and four muzzle-loading heavy guns (two 80pdrs and two 64pdrs). By 1888, the 80pdr guns were replaced with two 6inch 100pdr breech-loading disappearing guns. Five years after that, the defences were increased with the addition of two quick-firing Hotchkiss 6pdr guns. The minefield was closed in 1908, but the disappearing guns continued in operation until 1938.
Throughout its life, Fort Lytton was a major training base. Thousands of soldiers trained at Fort Lytton for the Boer War, World War I and World War II. For its first forty years the fort was also the main training base for Queensland's reserve soldiers. Each year up to 5000 reservists attended training at Fort Lytton's "Easter Encampment".
The Australian colonies were part of the British Empire, which had made many enemies by the nineteenth century, when other colonial powers were rapidly expanding their empires. At the time the fort was built, Brisbane had fewer than 100,000 people, with an annual trade worth more than four million pounds. Brisbane was more vulnerable to naval attack than Sydney or Melbourne as it was just three days' sail from the French naval garrison at Nouméa. Local defences were essential as Moreton Bay had numerous island on which the enemy could establish a base. Based on the recommendations of the illustrious British soldiers and military tacticians Colonel Sir William Jervois and Scratchley, Queensland opted to rely heavily on Fort Lytton as a fixed defence position for its capital and wealthiest port, Brisbane.