[Mobhack]

The results you can use - since a campaign has branches for decisive victory through decisive loss. You can then do different things along each potential branch, such as issue less repair points etc.

The map you can re-use, but not any damage to it, nor any wrecked junk from previous battles. Nor can units be "left in the same place" as a previous battle. Each scenario stands on its own, only affected by the previous scenario's victory level. Scenarios are really meant to be separate battles, campaigns are not meant for round 2 of the fight at the OK Crossroads, round 3 2 hours later etc. (Everyone gets refuelled and rearmed, if they are in good shape for example, and if you use the same map all battlefield debris has been swept up, thus inferring a few days at least between scenarios).