Found it, twas the opener for the final battle of Rorke's Drift.

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

Facing their doom, they sure did sing it well enough to stiffen your backbone.
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The ultimate result of shielding men from the effects of folly is to fill the world with fools.
-- Herbert Spencer, English Philosopher (1820-1903)