Fortress Wall

The Citadel, Halifax, NS

I  know nothing about the design of 19th century fortifications, and unfortunately during our visit to Halifax, The Citadel was not open for the season.  It was possible to walk the grounds, but none of the regular exhibits nor re-enactments were open.  So, I'm not really sure what rooms were buried under the earthen works seen along this wall.  I would imagine the rooms stored ordinance for the canons perched above and other supplies for the fort.  The rooms must have had fireplaces for heat as evidenced by the number of chimneys seen along this wall. Or perhaps these stacks provided a source of fresh air to the rooms buried below.