So, I've been about the site and I am looking for this game that I just can not find, so I thought I'd come here for help. I can't remember much, but it's basically....A medieval variant of SAS Zombie Assault, with Orcs instead of Zombies. Same concept though, with the barricade, and a certain space you've got to run around in, and you can hire knights and such to help you.
No, it's not Decision. Decision is a city where you fight undead and orcs. This is a closed-off area where you have a limited amount of space, and a certain number of barricades keeping out the orcish hordes. It's wave based.