Single Mission help

[mpresto]

I have finished all of the Battle of Britain missions, but the next level Battle of Stalingrad has not unlocked. Did I not Score high enough on the missions or something?

[Spitfire23]

it cant be that because ive got all missions unlocked in single missions. have you completed the battle of britain on campaign?

[mpresto]

nope i havn't

[Spitfire23]

that my friend is why you havent got them unlocked