How many letters does the top answer for “a fortified military post where troops are stationed” have?

The most common answer is fort (4 letters).

Crossword clue: a fortified military post where troops are stationed

2 answers found in Letterora's clue database (Wikidata facts, Open Trivia DB, WordNet and Webster definitions — all licensed sources).

fort 4 letters wn-def

a fortified military post where troops are stationed

garrison 8 letters wn-def

a fortified military post where troops are stationed