I was doing a little research and came across this drawing in an old book “Santo Domingo: past and present, with a glance at Hayti”
by Hazard, Samuel, 1834-1876; Making of America Project. Published in 1873.
This is the Alcázar de Colón / Columbus Castle, in ruins and the Bateria del Almirante in its entirety, as seen from Río Ozama. The image was drawn for this book so it has to be from the mid 1800’s. Note that there is no Malecon, only the port that came to the wall of the city of Santo Domingo. You can see the Puerta San Diego that leads to Las Atarazanas which is the old port loading docks and warehouses.
This is a picture taken from almost the same angle as the above drawing where you can see the Alcazar de Colón above the wall and the Bateria and Puerta San Diego. The Malecon (Avenida El Puerto or Francisco Alberto Caamaño Deñó) cutting right through the middle of the port and fort area.
In this present day picture they took out most of the Bateria del Almirante leaving a small part of this protection point when the Malecon cut through the center of the fort.