It's a trap
The Battle of Endor
Mon Mothma
"The data brought to us by the Bothan spies pinpoints the exact location of the Emperor's new battlestation. We also know that the weapon systems of this Death Star are not yet operational. With the Imperial Fleet spread throughout the galaxy in a vain effort to engage us, it is relatively unprotected. But most important of all, we've learned that the Emperor himself is personally overseeing the final stages of the construction of this Death Star.
"Many Bothans died to bring us this information. Admiral Ackbar, please."
Ackbar
"You can see here the Death Star orbiting the forest Moon of Endor. Although the weapon systems on this Death Star are not yet operational, the Death Star does have a strong defense mechanism. It is protected by an energy shield, which is generated from the nearby forest Moon of Endor. The shield must be deactivated if any attack is to be attempted. Once the shield is down, our cruisers will create a perimeter, while the fighters fly into the superstructure and attempt to knock out the main reactor."
Further Intelligence
The Bothans provided the Rebel Alliance with other useful information, such as the door code for the shield generator bunker on the forest moon of Endor. It is imperative that you send the code to endor@brickwars.net with the subject line "Bunker Code" and await further instructions. This information is classified. Do no share this information with anyone. The Empire has spies everywhere.