What is wagon fortress?

As an AI language model, I don't have any information related to a specific instance of Wagon Fortress. However, it is possible that "Wagon Fortress" refers to a type of mobile fortress that was used in warfare and battles in ancient times. These forts were made up of a series of wagons bolted together to form walls that were difficult to penetrate. They were primarily used by the nomadic people of Europe and Asia, such as the Scythians and Mongols, but also by various other cultures throughout history. Wagon forts were particularly effective against horse-mounted armies as they were highly maneuverable and could easily move to new positions.