Winterwolf was formed in 1997 by a bunch of Bolt Thrower and Celtic Frost obssessed Finns who... just happened to be awesome musicians.
A few years of intensive practicing and a few studio sessions produced two demos of riff-centric somewhat thrashy death metal with underlying Finnish OSDM grooves, deep gutterals, and incredible soloing, all complimented by an awesome oldschool production and Stockholm OSDM chainsaw guitartone.
The second of those demos, titled "Blood For Death" you can (and should) get here (Mediafire, I know, I'm working on it).
Their Guitarist/Vocalist Corpse moved away in 2001, going on to play Bass for the reformed Demilich when they began touring in 2005. The others went on with the band, recruiting new members to fill Corpses position, and decided to change their name to Deathchain.
But, in 2006 Corpse returned, and the band decided to bring back the old Winterwolf name and lineup, recruiting a new vocalist and later Corpse's newfound associate Antti Boman (Demilich, c'mon guys) to play guitar and add the sweet gurgly demon-frog-from-hell vocal style you all know an love to the band.
In 2009 they released a limited vinyl full length last year to be wildly released sometime this year on CD.