Use your low beams. The visibility in front of you will sharply decrease in a fog, so use the vehicle's low beam lights (if the vehicle does not have fog lights or driving lights). Heavy fog conditions prohibit use of high beam headlights. The light from high beam headlights will be reflected back by thick fog.
Largashbur, an Orc Stronghold. Orc Strongholds are scattered throughout Skyrim, High Rock, and Hammerfell. The Orcs have lived in Skyrim for centuries in tribal communities based around Strongholds. Orcs here live according to the rule of Malacath. Malacath, as Daedric Prince of the Orcs, is worshipped in these places.
Anduin, Khadgar and Medivh and a group of soldiers are attacked by Orcs and they capture the slave Garona, who is released by King Llane, and she shows them the location of the portal. Garona is contacted by the Orc chief of a clan Durotan that wants to meet King Llane to stop the fel magic.