The Promise is the fifth scenario of the Genghis Khan campaign in Age of Empires II: The Age of Kings. It is based on the Battle of Legnica (April 9, 1241), during the First Mongol Invasion of Poland (1240-1241).
- Starting Age: Castle Age
- Starting resources: 400 wood, 200 food, 200 gold, 200 stone
- Population limit: 75
- Starting units:
- Gaia units:
- Capture the Bohemian flag.
- Capture the Polish flag.
- Capture the German flag.
- Construct 3 Castles within the flagged area, and withstand the assault of the Bohemian army.
- Don't spend all of your stone at the Market. You're going to need it.
- Player (Mongols): The player starts with the starting units, a few Yurts, and a Town Center in the northeast.
- Bohemians (Teutons): The Bohemians have a heavily guarded fortification in the northwest. Their Castle is protected with Bombard Towers, Paladins, Champions, Siege Rams, Siege Onagers, and Trebuchets.
- Polish (Goths, Slavs in the Definitive Edition): The Polish are the weakest enemy, and are settled in the east. Their town features a Castle and a few Watch Towers, but is not walled. They train Long Swordsmen and Mangonels.
- Germans (Teutons): The Germans have walled a town in the south, and also initially hold the center of the map. They mostly train Teutonic Knights, Pikemen, Battering Rams and Crossbowmen.
For this scenario the player must capture the flags of their opponents by razing the nearby buildings and stationing units beside them. The enemies are the Polish (Blue, Goths/Slavs), Germans (Red, Teutons) and Bohemians (Green, Teutons). There are also Monks and Huskarls on a mountain southwest of the player's village that will join the player when found. In the Definitive Edition, the Huskarls are replaced with fully upgraded Elite Leitis; these can be used to raid the Polish base with minimal risk.
The Bohemians are the most powerful by far, with a massive army that will not attack unless provoked. As an alternative to attacking the Bohemians, the player may build three Castles inside a flagged area in the center of the map, which will cause the Bohemian army to attack.
It is best to defeat the other two enemies first, and then wall off passes between cliffs where the Bohemian army will attempt to flank the player. The player should build multiple walls and towers before completing the last castle. Mangudais are quite useful for sorties, as they have an anti-siege weapon bonus and can avoid the slower Bohemian Paladins and swordsmen. As with Persian War Elephants in the previous scenario, converting German Teutonic Knights is also recommended to boost the player's own forces.
- When this scenario and the following are opened in the Editor, the player's name is no longer Genghis Khan but Ogedei Khan.
- The Bohemians start with an army of 76 units, one over the unit cap for the scenario.
- The intro shows 80-year-old Genghis Khan dying of old age shortly after ordering the invasion of Poland. In reality, he died at 65, in 1227, while he was campaigning in China.
- Although the scenario depicts a very mountainous and forested landscape, the real battle took place in a plain. The rivers and lakes appear to be based on the real location, however.
- The arrival of the large Bohemian army from the north and its ambush by three Mongol castles is based on the Mongols luring the Poles and Germans to a grassy area coated in fuel, then setting it alight to blind the European knights with smoke and ambush them. This strategy was also used (and is referenced in the cutscenes) in The Battle at the Kalka River.
- King Wenceslaus I was indeed heading to the area with a large Bohemian force, but he missed the battle because the Mongols departed immediately to invade Hungary. Wenceslaus met a small Mongol scout party near Klodzko, however, and defeated it.
- The main force at Legnica was actually commanded by King Henry II of Poland, who died in the battle. There was a small Czech force led by Boleslav Depolt of Moravia, who also died.
- Despite their defeat, the Europeans considered it a victory because the Mongols did not advance further into Poland. Unbeknownst to them, the Mongols had no interest in conquering Poland and their invasion was solely to distract the Europeans from their simultaneous invasion of Hungary, in which they succeeded.
- Poland would be invaded again by the Mongols in 1259-1260 and 1287-1288. However these invasions were more for the purpose of pillaging and weakening the Polish nobles to prevent their interference in Hungary, rather than outright conquest.
- Bohemia and Poland are both Slavic nations. However, since the Slav civilization was not introduced until the Forgotten was released, Poland is represented by Goths (like in Henry the Lion) and Bohemia by Teutons (like in Holy Roman Emperor), likely due to Bohemia being one of the Imperial States in the Holy Roman Empire.