From Star Trek
A Klingon sleeper-ship launched in 2290, when the Klingon Empire was still at was with the Federation. The captains name is K'Temoc.
It reached its destination, near the Boradis system, 75 years later, still thinking that they were at war with the Federation. The half-Klingon Federation emissary K'Ehleyr is send to convince the T'Ong crew that their is no war anymore.
The T'Ong is a big risk because they are near the Boradis system where a number of Federation colonies and outposts with minimal defenses.