The Irish Press (16 August 1969)
While the attack on the British Embassy in Dublin after Bloody Sunday in January 1972, is more widely known and certainly was more successful, there were attempts to burn the building down three years previously after the Battle of Bogside and the turbulent events of August 1969.
During Saturday night (August 18) and the early hours of Sunday morning (August 19), thousands of protestors laid siege to the embassy and attacked the building with petrol bombs, bricks, stones and bottles. Gardai baton charged the crowd twice. At least 50 people were injured, including 16 Gardai.
In the city centre, at least 60 premises were attacked with 80 plate-glass windows were smashed. More seriously, in the eyes of the Gardai, “pump handles were wrenched off numbers of petrol pumps at filling stations adjacent to the embassy in the demonstators’ endeavours to get petrol”.
Around the Holles Street and Merrion Square area, where the embassy was situated, barricades were built, cars were burnt and a large fire was started outside the Mont Clare Hotel.
At least 17 people were up in the court in the following days after being arrested during the clashes in Dublin.
During protests in the city earlier in the week, thousands descended on Collins Barracks to demand guns and several were injured in scuffles outside its gates.
“A girl is comforted by a photographer after being injured in Saturday night’s clashes at the British Embassy”. The Irish Press, August 18 1969.
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Click on the book for more.
Come Here To Me! 
From even earlier the same year
http://photopol.com/bios/jan_69.html
There was considerable trouble at the British Embassy after a march to protest at the batoning of Derry civil rights marchers in October 1968 as well.
Privately the Gardai considered the location of the embassy a nightmare in terms of security.
What’s interesting about the rioting is how it spread to Grafton St and O’Connell St and developed into clashes between people who may, or may not, have been at the original marches, and the cops. This was a feature of a lot of violence in Dublin associated with protests about the North, in the 70s and 80s as well.