From the campaign:
Vanguard recreates cinematic, brutal skirmishes between small warbands of handpicked fighters. Players carefully select their squad of characters then fight it out to complete life or death missions - that can help turn the tide in the battle to come!
These can be played as one-off narrative missions between elite fighting forces, but Vanguard is also fully compatible with your larger games of Kings of War. By linking battles in Vanguard to your mass battles, thanks to the innovative interlinked campaign system, victory in Vanguard could mean you’ll gain access to better magical artefacts, new units or even the chance to deploy in better positions. Meanwhile, defeat could force your units to arrive late or your deployment options will be hampered.
They're already 2/3 of the way to their goal with still 15 days on the clock.