How does an army just disappear?

"The remains of a mighty Persian army said to have drowned in the sands of the western Egyptian desert 2,500 years ago might have been finally located, solving one of archaeology's biggest outstanding mysteries, according to Italian researchers."

http://www.msnbc.msn.com/id/33791672/ns/technology_and_science-science/

Whoa. Especially because when they say "drowned in the sands", they really mean drowned in sand.

On another note, I need to figure out how to make pretty links, because I'd love to for this blog to look slightly less amateur. Slightly.