Defenders of this Texan mission were killed in an 1836 siege (5)

I believe the answer is:

alamo

(Other definitions for alamo that I've seen before include "Famous Texan fortress" , "Texas mission taken by Mexican forces in 1836" , "Texan battle" , "historical Franciscan mission" , "Texas fort famed for defence against Mexican army" .)

I've seen this clue in The Times and The Sunday Times.

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