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A Plea for Captain John Brown is an essay by Henry David Thoreau. It is based on a speech Thoreau first delivered to an audience at Concord, Massachusetts on October 30, 1859, two weeks after John Brown’s raid on Harper’s Ferry, and repeated several times before Brown’s execution onDecember 2, 1859. It was later published as a part of Echoes of Harper's Ferry in 1860.

Source: http://en.wikipedia.org/wiki/A_Plea_for_Captain_John_Brown