Whiteout (Warhammer 40,000)

The orks of Waaagh! Dregsmasha have invaded the planet Atrophon, and, even reinforced by the Astra Militarum, the local defence forces are struggling. To break the stalemate, a Deathwatch team are sent in to take out the orks' leader, a wily mechanic whose insane inventions are giving the greenskins a constant advantage. But when the Space Marines' drop pod crashes off course in a blizzard, the only way they can reach their target is over a massive bridge swarming with orks...

Read it because
Off-course, alone, and with their mission in peril, the Deathwatch hunker down and do what they do kill aliens by the bucketload.