The Klingons also sent a second bounty hunter and a battle ensues, after which Archer is handed over to the Klingons.
Races from the original Star Trek such as the Romulans, Klingons and Vulcans have played roles of varying importance in the series.
The Federation, Cardassia, the Klingons, Romulans and all races in the alpha quadrant must learn to reconcile their differences and make peace to unite against a common (and deadly) enemy.
They instinctively dislike Klingons, a handy trait when trying to ID Klingons in your midst, and are death to grain.
An example of this is in Star Trek; original series Klingons were essentially humans with long stringy hair.