Marfa Ridge Gun Post I is one of two Marfa Ridge Gun Posts. These two Gun Post are only 40 metres apart on the East slope of Marfa Ridge where is drops down to the main road between Mellieha and Circkewwa.
The two post both face North East and were probably intended to cover the main road as well as the beaches area around Armier Bay. It is believed that they were armed with 18-pdr field guns.
The Gun post has a simple shelter for the field artillery piece, with one side open for the gun to fire out of. The is a semi-circular sill around the back of the post, presumably a stop for the gun carriage when recoiling.