This bastion has been named after the hometown of Commander Wilhelm Jacobs Coster who led the Dutch conquest of Galle Fort.
This is located next to the old Dutch hospital building. There is a belief that it was once used during the Dutch period for postmortem examinations.
It is an excellent vantage point for the observation of the Galle harbor and bay. From the British period onwards, it has been used as the official residence of the Harbour Master. It is believed that there were 7 canons installed here to protect the bay from invading vessels.
Another interesting feature of this bastion is the old breadfruit (Artucarpus incisisus) tree found here which is believed to the first bread fruit tree planted by the Dutch on the island of Sri Lanka.