Wonderful stuff Brian and lucky you were there to capture this example of an alien attack in progress. Mind, there seems to have been a bit of a miscalculation on their part similar to that described in the Hitchhikers Guide to the Galaxy - to quote from Wikipedia:
"Two species which existed in the distant past, a very great distance from the Milky Way galaxy. The G'Gugvuntt were enemies of the Vl'hurgs, and these strange and warlike beings are on the brink of an interstellar war, because of an insult uttered by the G'Gugvuntt leader to the mother of the Vl'hurg leader. Resplendent in their black-jeweled battle shorts, they were meeting for the last time, and a dreadful silence filled the air as the Vl'hurg leader was challenging the G'Gugvuntt leader to retract the insult. At the precise moment, the phrase "I seem to be having tremendous difficulty with my lifestyle" (muttered by Arthur Dent to himself, which for some strange reason was carried by a freak wormhole in space back in time to the farthest regions of the universe where the G'Gugvuntts and the Vl'hurgs lived) filled the air over the conference table, which in the Vl'hurg tongue was the most dreadful insult imaginable. It left them no choice but to declare war on the G'Gugvuntts, which went on for a few thousand years and decimated their entire galaxy.
After millennia of battle the surviving G'Gugvuntt and Vl'hurg realised what had actually happened, and joined forces to attack the Milky Way in retaliation. They crossed vast reaches of space in a journey lasting thousands of years before reaching their target where they attacked the first planet they encountered, Earth. Due to a terrible miscalculation of scale the entire battle fleet was swallowed by a small dog. The Hitchhiker's Guide to the Galaxy states that this sort of thing happens all the time."
Why is the contrast so much lower in the bottom LH quarter?
Thanks, Rob. Much appreciated. 
