Refers to a fortified military structure, often a large castle-like complex. Similar to 要塞 but can carry a slightly more historical or literary tone.
See also: 要塞
A medieval fortress towers on the hill.
The stronghold was known to be impregnable.
Standard kanji spelling for fortress or stronghold.
Alternate kanji spelling; 砦 (fort) emphasizes the defensive structure.
Compound of 城 (castle) and 塞 (fortress, stronghold). The kanji 砦 in the alternate spelling also means fort or stronghold.