Roundel (fortification)

This article is about the artillery tower. For other meaning, see Roundel (disambiguation).
Roundel in Fort de Salses (southern France), 15th century, drawing by Viollet-le-Duc
Roundel of Fortezza Firmafede in Sarzana (north Italy), 15th century

The roundel is an artillery fortification with a rounded or circular plan of a similar height to the adjacent defensive walls. If the fortification is clearly higher than the walls it is called a battery tower.