 After docking, the Agena could also be fired by the astronauts to raise the combined Gemini-Agena spacecraft into a higher orbit.The first attempt at such a docking mission was made for the Gemini 6 mission on October 25, 1965, but the Agena suffered an engine failure and did not reach orbit.This forced postponement and replanning of the Gemini 6A mission, which performed rendezvous with Gemini 7 without docking.