Well there have been gigbytes of data written about the events of Bloody Sunday. The short version is this:
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from:
http://larkspirit.com/bloodysunday/
On January 30, 1972, soldiers from the British Army's 1st Parachute Regiment opened fire on unarmed and peaceful civilian demonstrators in the Bogside, Derry, Ireland, near the Rossville flats, killing 13 and wounding a number of others. One wounded man later died from illness attributed to that shooting.
The march, which was called to protest internment, was "illegal" according to British government authorities. Internment without trial was introduced by the British government on August 9, 1971.
The British-government-appointed Widgery Tribunal found soldiers were not guilty of shooting dead the 13 civilians in cold blood.
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You can google more detailed information, you'll get well over 700,000 hits though [img]tongue.gif[/img]