They were both created in 1785 on the sites of previous constructions and named for a British Captain who was one on the first on shore during the Capture of Gibraltar in 1704.
The bastions (north and south) are located along the Line Wall Curtain on the West Side of Gibraltar.
[3] In 1841, General Sir John Thomas Jones produced a report on Gibraltar's fortifications in which he proposed enlarging North Jumper's Bastion to its current proportions.
The long south flank has embrasures for six guns, underneath which are six casemated bombproof barracks, each with room for 32 men.
It has a flat face that runs parallel to the curtain wall and is more akin to a platform than a bastion, as it was designed to be defended through musket fire only.