the song of retribution finds its self and its crew in equestrian airspace after having its slip-space drive damaged by human vessels and managed to escape mostly intact. having lost almost all ways to contact its fleet, or any other ship, the ship master contacts the sentient creatures on the ground and asks to meet their leaders/leader. the 4 princesses of equestria meet the ship-master and make a deal. supplies for major defensive backup.
(will see where it goes from there.readers ideas shall help decide what happens at certain chapters.)