's-Hertogenbosch's fortifications were shaped over the centuries. Archaeological surveys have given us an impression of what the fortifications used to be like.
Since 1977, archaeological research in 's-Hertogenbosch has been carried out by the town's own municipal archaeologists.

 The following links provide more extensive information on 's-Hertogenbosch's fortifications:

• Development history of the fortifications 
• Time line 
• Archaeology as the basis for project plans
• Siege of 1629