bastioned trace

The bastioned trace was a dominant element in fortification for approximately 300 years, becoming obsolete in the 19th century. This design featured projecting works with two flanks and two faces that met at an angle. This allowed defenders to direct fire in front of neighboring bastions and along the connecting walls.1

The development of cannons capable of breaching masonry walls in the 15th century led to a shift in fortification. Instead of building high walls, defenses became lower and screened, with earth from ditches forming ramparts and parapets for protection. The bastion design was crucial in eliminating "dead space" directly below the parapet, enhancing defensive capabilities.1

The citadel at Antwerp, built in 1568, was a renowned example of a fortification with a bastioned trace. However, by 1889, Antwerp was encircled by "ring fortresses" that replaced bastions with detached underground strongholds, marking the bastion as a relic of past warfare.1