Derry city walls

It began when 13 apprentices took the keys for the city's gates and locked them against the advancing forces of the Earl of Antrim who were loyal to James II.

The siege would continue until 1 August when ships carrying food and supplies broke through the boom across the River Foyle and relieved the city.

[4] The march was already seen as provocative to many of the city's Catholic population and, along with the tension that had already been building, rioting broke out that turned into the Battle of the Bogside.

[5] Especially given its prominence facing the Bogside, many nationalists found it an offensive symbol of Protestant ascendancy, hence why the IRA targeted it for destruction.

In 2005, 24 of the cannons (including two displayed at Brook Hall) were restored to their former glory, with the famous 'Roaring Meg' located at the double bastion near Bishop gate.