Marsa Battery - Credit: Wikimedia Commons
Marsa Battery () was an artillery battery in Marsa, Malta, built by Maltese insurgents during the French blockade of 1798–1800.https://www.um.edu.mt/library/oar/bitstream/123456789/62252/1/L-Irwol%20tal-batteriji%20fil-Menqawaqt%20l-Imblokk%20tal-Franċiżi.pdf It was part of a chain of batteries, redoubts and entrenchments encircling the French positions in Marsamxett and the Grand Harbour. Read more on Wikipedia
Source: en.wikipedia.org