Repairs were carried out 1730–1734 and for the rest of the century, parts of the castle were adapted for garrison accommodation. In 1770, the rooms inside the Keep were occupied by officers and soldiers from the Island's garrison. The old Catholic chapel, known as St Mary's Chapel, was converted into a barrack room for 60 men with bedsteads and other fitments installed in the chapel. In 1800, the Corbelled Tower was fitted out for use by d'Auvergne as his private headquarters. Over the course of the 19th century, detachments of troops were housed in the castle. Until the second half of the 19th century, the castle was open to the public on one day a year,
Easter Monday, and crowds used to flock from all over the island. This is believed to be a survival of the pre-
Reformation custom of visiting St George's Chapel inside the castle on
St George's Day. The castle continued to decay, and due to its generally ruinous state it was handed over to the people of Jersey by
the Crown on 28 June 1907. Mont Orgueil has been managed as a museum site since 1929. During the
Second World War German occupation (1940–1945), the castle was occupied by the Germans. Initially a small picket was installed on the top of the Keep and the Gardien of the castle, Captain Joe Dorey, was allowed to stay in his cottage in the Lower Ward. This soon changed when
Adolf Hitler ordered that
Channel Islands undergo an intensive building programme, aimed at turning the Islands into "an impregnable fortress". In 1941, more troops were billeted inside the castle and the Gardien and his family were evicted. This included elements of the Army Coastal Artillery Regiment 1265, who manned the three observation towers at the top of the Keep, and a small detachment of German Infantry. In July 1944, a makeshift bunker was constructed within the castle; which served as the headquarters for the 1st Battalion of the Army Coastal Artillery.
Royal visits In 1846, the castle was visited by Queen
Victoria and
Prince Albert. The castle has also hosted subsequent royal ceremonies to welcome
George V in 1921 and
Elizabeth II; inscriptions mark the occasions. ==Present day==