under the arch there is an image, this looks like the devil and is called Old Nick.
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The castle was rectangular with two storeys and dungeons. It was orientated on a north-west/south-east axis and provided a heavy gun emplacement, quarters for its garrison and underground magazines and was surrounded by a ditch and a series of ramparts. The garrison in 1588 consisted of 50 men.
The fortifications were surveyed in 1576, were last improved in 1623 and formally abandoned in 1665, although retained as a store until at least 1691.
The royal coat of arms was saved and can be seen above the south entrance door at All Saints Church in nearby Wyke Regis. Being Tudor, the lion rampant is joined at the shield by a wyvern rather that the unicorn.
Designed specifically as a coastal defence, Sandsfoot Castle was always vulnerable to attach from a landward direction, and often changed hands during the Civil War. The castle dungeons were used as a mint during the Civil War, giving it a greater importance to both defenders and attackers.
http://www.weymouth-dorset.co.uk/sandsfoot.html