Andy: "the shot heard round the world"
The quote is from Ralph Waldo Emerson's famous poem, "Concord Hymn," about the Minutemen and the start of the American revolution, sung at the completion of the Concord Battle Monument on July 4, 1837. The first four lines are:
By the rude bridge that arched the flood,
Their flag to April's breeze unfurled,
Here once the embattled farmers stood
And fired the shot heard round the world.