The ___, mission in San Antonio, Texas, that was the site of a siege and massacre by Mexican forces in 1836 (5)

I believe the answer is:

alamo

(Other definitions for alamo that I've seen before include "Mission building in Texas, site of famous siege by Mexico" , "US mission" , "Site of a Texas siege, 1836" , "ill-fated mission" , "Scene of massacre in Texas" .)

I've seen this clue in The Independent.

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