yes you can . Just re-load one of your pbem turns , preferably the set-up turn otherwise you'll get also the terrain deformations ( destroyed houses , craters caused by explosions etc... at the moment of the save )and save the game . Quit and start a quick battle the usual way and when you get the screen with "map type , tree coverage etc..." , click on " load map from file " and select the file you've just saved .
I hope it helped you .