Free Reign of Swords game for iPhone and iPod touch.
Regular price is £1.59 I think.
App page says that game is free for today only, but as developer is American it can actually expire tomorrow in UK. Price changes can happen by US time.
Play one of the most award-winning and critically acclaimed games of the year! Engage in epic online battles with a customized army in a fantasy world of magic, steel and strategy. Build up your army by gaining troops, technology & magic through engaging campaign missions that feature fortress sieges, ambushes, stealth attacks and huge open-field clashes. Then battle your friends online! Receive in-game rewards such as new units & technology each week based on your score in a kingdom. http://www.mobilebattles.com.
WARNING - Link opens iTunes