A Mighty Fortress – Martin Luther

The LORD Almighty is with us; the God of Jacob is our fortress. (Psalm 46:7)

There's not much one could add to the story of Martin Luther, and his great hymn "A Mighty Fortress". It's said that it's based upon Psalm 46, which many believe Luther sang often with his compatriot Philipp Melancthon when they felt their cause was in great distress. There's four theories regarding exactly when Luther wrote the song -- all were when Luther and his fellow strugglers faced a test, a confrontation with the government, or were remembering those who gave the supreme sacrifice in the struggle to reform the church. See the websites below…they will inspire and inform you. And, the next time you sing Luther’s hymn, thank God that his servant Luther stood firm, that he was girded by God’s promises – that our God is a ROCK. 

(Dec. 2019 update): Another possibility is that the deaths in the summer of 1527 of three people close to Luther prompted the hymn’s composition, those three people being Leo Kaiser (a martyr for expressing his evangelical faith), and Hanna Bugenhagen (who died from the Plauge) and her daughter who was stillborn.  
 

See the following websites for lotsa history on Luther’s “A Mighty Fortress”:

http://en.wikipedia.org/wiki/A_Mighty_Fortress_Is_Our_God

http://www.whatsaiththescripture.com/Poetry/A-Mighty-Fortress.html

Also see the biography entitled “Martin Luther: The Man Who Rediscovered God and Changed the World”, by Eric Metaxas, Penguin Books, 2017, p. 386 for discussion of the triple deaths that affected Luther in 1527.