Share This Article “Roaring Meg” was a cannon used in this action. Bombardment of Ft. Sumter, 1861 Siege of Londonderry, 1689 Battle of the Somme, 1916 Siege of Scarborough Castle, 1645 Siege of Londonderry, 1689. One of 24 cannon sent from London for defense of the Irish city of Londonderry, it got the nickname “Roaring Meg”: because of the loud noise it made when it fired.