A Moment in History: The Rock that started the Irish Troubles - Battle of the Bogside 12th August 1969

I came across this film a few years ago and I believe you can see the very first stones thrown ( at around 1:12 ) that started what is now known as "The Battle of the Bogside" which in itself started 30 years of what we know as "The Irish Troubles".
The annual Apprentice Boys parade on 12 August commemorated the Protestant victory in the Siege of Derry in 1689 and was considered highly provocative by many Catholics. Derry activist Eamonn McCann wrote that the march, "was regarded as a calculated insult to the Derry Catholics".

Although the march did not pass through the Bogside, it passed close to it at the junction of Waterloo Place and William Street. It was here that trouble broke out. Initially, taunts were exchanged between the loyalists and Bogsiders. Stones were then thrown from both sides for a period, before the police forced the nationalists into Rossville Street and the Bogside itself. They were followed by local supporters of the Apprentice Boys, and the confrontation escalated.
Large crowds turned out in the Bogside, pelted the police with stones and Molotov cocktails, and manned pre-prepared barricades to block their progress - which the RUC tried to clear with armoured cars. Out of 59 officers who made the initial incursion, 43 were treated for injuries.

Further Reading Here; en.wikipedia.org/wiki/Battle_of_the_Bogside