The cause of the incident was that the people of Northern Ireland were dissatisfied with the inhumane practice of detention by the British government without trial and decided to hold a march on January 30. British Army General Ford (Tim Pigott-Smith) also issued a statement defining this as an illegal march and will carry out a crackdown. The conflict between the two sides had been highlighted the night before, and the situation was on the brink of outbreak. Cooper (James Nesbitt), a moderate congressman from Northern Ireland, realizes that the situation is serious and warns people to exercise restraint and never use violence. On the other hand, Britain sent a team of paratroopers as a vanguard to prevent the Republican Army of Northern Ireland from waiting for a chance to revolt. The parade was carried out in a tense atmosphere, and the order of the first half was completely undermined by the chaos that followed. A group of excited young people deviated from the parade route, protesting and throwing stones at the garrisoned British troops. The British responded with high-pressure faucets, tear gas and rubber bullets. Then the situation became more and more serious, and the British began to shoot at the people with real guns, even the old man with a white handkerchief on his arm. The frightened people fled in all directions, and many fell in a pool of blood and did not get up again. After the riot ended, the army.