Sega and The Creative Assembly have just released a demo of Empire: Total War through Steam. The demo includes two historic scenarios, one land battle and one naval battle. Details below straight from the press release...
"Playing as the British Empire, you'll take on the American Army in the pivotal ‘Battle of Brandywine Creek' and then the French Navy in the decisive ‘Battle of Lagos'."
The full game will see release on March 4th.