This part known as “Kalu Kotuwa” at present was called “Saint Croose” or “Fortaliza” by Portuguese. This Kalu Kotuwa had been equipped with various requirements of war such as tunnels, underground caverns, closets and warehouses as usual for a Portuguese Fortress. Facilities had been provided on the ground floor to erect cannons aimed towards the harbor. The circular shaped front of the upper floor was connected to the ground floor with a tunnel passageway tall enough even for a soldier to walk along.
In here are some watch huts used by soldiers as well. The outer wall of the rampart at this place is made of coral limestone using plaster of lime and sand. Klu Kotuwa is the oldest and the strongest memento reflecting the contribution by Portuguese for the construction of this enormous monument called Galle Fort.