how on earth do you go from London to Atlanta over Sirrurg's territory? There's a story right there.
Here're a couple of interesting tidbits to run with about that.
The attack was the first known sighting of Sirrurg, who was unknown at the time. If he was awake and active before that, it was well hidden, which isn't his usual MO.
The next time he's seen is a decade later, in Amazonia, with two other Great Dragons, stomping a mudhole in Aztechnology forces. Hulupa is the second, but the third's never been identified. Lots of speculation, no confirmation. He stays active there for decades, until he seems to have broken away at some point in the 2070's. He may, or may not, still have assets in Amazonia, and what other lairs he might have are unknown.
(As for the Third Dragon, Pobre, Hestaby, and the RainQueen are the three names that usually float around, but, there are other options.)