Gudadantza: Does "Integrated graphic card not supported" mean that the game won`t work at all even if the rest of the requirements are met?
Fortunately - not always. This phrase is often used (steam, gog etc) because dev/publisher don't want to take responsibility for their games to be compatible with all kinds/flavours of integrated graphic cards, which theoretically should work fine with X game, but in practice it's a lottery.
I personally, back in the days when my only computer was laptop (and bit earlier even worse - humble netbook), had succeeded in a couple of games which didn't support integrated graphic cards.
But as I've mentioned - it can be a lottery (highly depending on your graphic card model... and willing to experiment/find a workaround).
IronArcturus: Does Warhammer: Mark of Chaos have a skirmish mode?
I've just checked - yes, it does. And with plenty flavours in terms of choosing side (Empire, Chaos, Skavens, High Elves, Dark Elves, Orks & Goblins)