As thousands of onlookers cheered from Castle Island in South Boston, the USS Constitution sailed under its own power Sunday for just the second time in 131 years, marking the 200th anniversary of the battle that earned it the nickname Old Ironsides. “It’s a twice in a lifetime opportunity, sailing on her own power,” said Bob Pound, 48, of Quincy, referring to the last time the USS Constitution sailed on its own in 1997 for Marblehead’s 200th anniversary.
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