Started new campaign as Belgae tribe, when besieging a minor enemy city (with a ram), when i click "assault" option to start the battle it just loops the "attack with sword" animation on the world map that usually plays before besieging a city.

However it seems as is the game is stuck, i can't exit nor click in any of the menu's or options, and the only option is to exit is to kill the process using task manager.

To be clear it just see my general doing the "attack with sword animation" on the world map and that's it, can't do anything else and no siege battle loads in like it usually should.
reason
ANy ideas?