The ants go marching...

Bunch of ants all marching from one hole to another hole about 10 feet away. I've never seen such a mass migration of ants before. They were almost all going in the same direction. They weren't carrying anything. They all looked like the same kind of ants, and didn't seem to be fighting. I've walked this way dozens of times and never seen it before or since. My buddy and I watched this go on for more than five minutes, a steady stream of ants. Anyone know what they were doing? Maybe running from the Egyptians and about to wander the desert for 40 years?