Morgenroete

Are there any better tutorials to teach new players how to play (and win?) I can't seem to get the hang of this game. I will engage an enemy with 3 times the number of forces in open field, with artillery support and he will beat me almost every time. Also is there a way to make your men fallback but in order? It seems the ai is able to have troops march backwards but continue to shoot. I really like this 90s style of rts and want to get good at it. Can anyone help me? Regards Morgenroete