Assertion: gunpowder's use | /r/MadeOf | redoubt
Facets:
Source sentences:
text: To guard against artillery and gunfire, increasing use was made of earthen, brick and stone breastworks and redoubts, such as the geometric fortresses of the 17th century French Marquis de Vauban.
text: Instead of majestic towers and merlons, the walls of new fortresses were thicker, angulated, and sloped, while towers became lower and stouter; increasing use was also made of earthen, brick, and stone breastworks and redoubts.