Yoda was the Jedi Grand Master leading up to and during the Clone Wars. He disappeared after attempting to kill Emperor Palpatine, who was secretly the Sith Lord.
While in hiding, Yoda waits for the galaxy’s new hope to come of age. One year ago he felt a disturbance in the force. A disturbance that changed the destiny of the galaxy. He used the Force to monitor the two offspring of Anakin Skywalker. He felt that one was lost, and he watched the other join the Imperial Navy. It was then that Yoda realised that the galaxy’s last hope was lost.
After feeling the effects of the Death Star, Yoda knew that he had to put events in motion. He sent out a Force message to a few beings that were strong in the Force. These people received a single message.