Theater shield

The Theater shield of the Rebel Alliance Echo Base was a umbrella shaped barrier that once protected the base from orbital bombardment and could resist any attack to it. The origin of the shield has it's beginings at Ralltiir, where the planets scientist had been developing it in affiliation with the Rebel Alliance. After the Battle of Ralltiir the scientist where transported to Hoth and using the salvaged reactor from a scrapped Praetor-class Star Battlecruiser the Rebel Alliance was able to build and power the shield to protect the base from Imperial attack should they be discovered or if an asteroid from the Hoth asteroid field breaks off and on a course for the base. Unfortunitly dispite the advantage off being able to withstand any orbital bombardment, the shield has two distinct weaknesses; the shield can only block orbital bombardment but it cannot stop enemy force from entering the shield from the ground level from beyond the perimeter and because the generator itself is outside the base out in the open, it can be gotten to by an enemy vehicle and destroy it, causing the protective umbrella to collapse. Opening the base to weapons fire from orbit or allow enemy ships to directly approach the base. The shield was used only once, during the Battle of Hoth when an Imperial Probe Droid  detechted the base because of the exposed shield generator and before being destroyed by Han Solo and Chewbacca sent images to the Imperial Starfleet informing them of the Rebels location. When the Imerial fleet arrived the shield had been raised to buy time for the evacuation ships to be loaded and launched by temporarily dropping the the protective umbrella to allow one transport and two fighter escorts through and to allow the Ion cannon to shot at any Imperial ships blocking the way, but as the battle intensified the Rebels where forced to make the risky move of launing two ships at a time. Dispite the the efforts of the Rebel Troopers and Snowspeeders an AT-AT piloted by General Veers managed to destroy the generator allowing TIE fighters, Imperial Snowtroopers and Darth Vader himself to approach the base.