A series of raids in which a Klingon band led by Korok extorted deuterium from a small mining colony, until the Enterprise crew taught the colonists to resist in 2152.
The raids are the subject of the Enterprise episode Marauders. Seeking deuterium, Enterprise NX-01 visits a small alien mining settlement whose leader, Tessic, is oddly unwilling to trade. Archer learns that Klingons under Korok come regularly to take most of what the colony produces and have killed those who objected.
Archer decides against simply driving the Klingons off, since they would return once Enterprise had gone. Instead the crew train the colonists: T'Pol teaches defensive moves, Reed drills them with weapons and Hoshi Sato proves a fine shot.
The camp's buildings are quietly moved so that the Klingons beam down on top of the deuterium field. When it is set alight around them, Korok's men decide the colony is not worth the trouble and leave.