The Dominion is ruled by the Altmer and their vassal slaves. Pay heed to their weakness and cowardice: they employ a combination of subterfuge, magic, and dirty tricks that can trip up a stout-hearted, honorable soldier such as yourself.
The cowardly Wood Elves are best noted for their unwillingness to engage in a face-to-face attack; a Bosmer will strike at you from every side except the front. You won't cross swords with a Bosmer, but you might catch an arrow in the throat. Be wary in forests and jungles, and watch your back.
Khajiit may look cuddly, but they are no laughing matter in a fight. Don't expect duels to end if you can disarm them. They possess razor-sharp claws that can puncture light and leather armors. And it's said that their tails can be used as crude third hands, wielding daggers and throwing knives with deadly accuracy.
Then there are the High Elves themselves. Although the haughty Altmer are often undone by their own arrogance, in a fight their considerable reach can pose a problem. Close the gap between you and your target. Make their height a liability. Strike low and bring them to the ground.
With a little study, a stout-hearted Covenant soldier such as yourself will be able to easily cleave through dozens of pathetic Dominion conscripts!