The Barracks is a building.
upgrade => Great Barracks
This building is an improvement of the Training Camp. It therefore requires the latter to be built.
The creation of the armory is only possible if the technology Coat of Mail has been enabled in the province.
This building requires 9,300 man-days
The construction of the building requires 2 political points, 5,000 gold, 10 stones, 10 tools, 10 iron, 25 weapons.