Fortress Hill炮台山;地铁站
flying fortress空中堡垒;飞行堡垒;轰炸机;第六关漂浮的要塞
Dwarf Fortress矮人要塞;矮人堡垒
Battle Fortress战斗要塞
Glacial Fortress冰封要塞;蓝白地;蓝白双色地
Blasted Fortress炮轰要塞
Final Fortress最后要塞;最后堡垒;终极防御
Hwasong Fortress华松古堡
Simply speaking, fortress defence is to fight with fortress as base.
简单说来,城池防御就是以城池为依托进行作战。
参考来源 - 宋代城池防御探究N-COUNT（可数名词） A fortress is a castle or other large strong building, or a well-protected place, which is intended to be difficult for enemies to enter. 城堡; 大堡垒; 要塞
...a 13th-century fortress.
…一座13世纪的城堡。