Code 1-5 signified the Rebel Alliance's directive to commence the evacuation of Echo Base located on the planet of Hoth. This order was enacted during the Battle of Hoth at the moment that Imperial AT-ATs overwhelmed the defensive measures of the base.
Using Rebel transports, the Rebels carried out the removal of their gear and staff. Each of the transports individually tried to break through the Imperial blockade encircling the planet, utilizing randomized escape routes and supported by the ion cannon at Echo Base. Two X-wings provided a small escort for each starship.