Warcraft III: Battlechest Cheats

In Chapter 3 of the Blood Elf campign
In your travels thrugh the dunguns you will encounter a large battle in the south center area of the map, if you go south of this battle and through the iron gate on the left you will see three sheep, click the platforms in front of them in this order: TOP THEN BOTTEM THEN MIDDLE, the iron get to the north will then open, pick up the question mark then beat the level normally to unlock the bonus mission called The Crossing.
For beating The Crossing completely, you'll gain access to a Pandaren Brewmaster in Chapter Four: The Search for Illidan.