Mon Aug 16, 2010 11:55 pm by Technocrat
It must be some sort of bug, then. If someone else was attacking it, you would've had to wait 10 more minutes (which you didn't) and then your attack would be canceled (which it wasn't). And if another player went to attack that oasis after you set off for it, he would've waited 10 mins and then had his attack canceled. Neither of those apparently happened.
At the end of the war report, did it have a player's name, as in "Billy-Bob got prestige 1234", because that would make it certain that it was another player's army you encountered.