He beat me to it.
Msgr. Charles Pope, a blogging priest of the Archdiocese of Washington, wrote this piece on the biblical roots of the Battle Hymn of the Republic.
Attenders of Daily Mass (and priests) must have noticed pieces of the tune in recent first readings from the Book of Revelation. Julia Ward Howe knit these pieces into a rousing tribute to God's steadfast purpose in judging the nations.
Pope's piece is appropriately appointed with a picture of "Musclebound Jesus" (from the Basilica of the National Shrine of the Immaculate Conception in Washington).