Siege adjectives are listed in this post. Each word below can often be found in front of the noun siege in the same sentence. This reference page can help answer the question what are some adjectives commonly used for describing SIEGE.
actual, assyrian, bloody, brief, british, celebrated, close, constant, day, desperate, disastrous
dreadful, entire, famous, fatal, final, first, formal, french, fruitless, german, great
hard, heavy, huge, inch, laid, large, last, late, lay, lengthy, long
longest, memorable, military, month, new, obstinate, other, ottoman, prolonged, protracted, prussian
regular, roman, royal, same, second, severe, short, strong, subsequent, successful, tedious
terrible, third, turkish, unsuccessful, vigorous, week, whole, year
Hope this word list had the adjective used with siege you were looking for. Additional describing words / adjectives that describe / adjectives of various nouns can be found in the other pages on this website.