Star Trek: Deep Space Nine: Season 5, Episode 4

5 - 4: ...Nor the Battle to the Strong

On their way back from a medical conference, Jake and Dr. Bashir are diverted to the Federation colony on Ajilon Prime who have been attacked by the Klingons. However, when the the Klingons renew their attacks on the colony, Jake is forced to confront the hard realities of war as battle erupts around him.