It took my campaign a long while until the front line finally pushed back into a large chunk of France.
From there on I became the MVP in bombing and straffing.

WWWHHHHHEEEEEEEEEWWWWWWWWWWWWW
KaBOOOOOOOOOOOOOOOOOOOOOOOOOOOOOMmmmmmmmmmmm
For those of you who are new to bombing missions, I suggest that you gain a good distance between you and the ground prior to releasing your payload.
That way, you won't get caught by the blast wave of your own bomb. Don't forget that the tanks can shoot at planes.
Speaking of tanks, everyone knows that it's best that you shoot or bomb the living cr*p out of the LEADING TANK (the tank at the very front of the enemy column). That way, they'll stop on the spot.