From: Bristol, UK
Also, you need to look at what happened to the CV in the detail screen. You will often see something like Attacker 110->30 (meaning they had 110 cv basic before the combat evaluation but the factors Joel mentions, and leader check etc dropped it to 30. If the Defender shows 40->120, you know they benefited in this process. Your initial odds would have been 110:40 so a sure win, but what actually happened was a 30:120 thorough push back of the attack. Once you have seen this you can look further into the combat to see why maybe. Things to check: disrupted and tired (high fat) units for instance. A mistake people often make is to attack the first time and get 1.8:1 say, and think 'one more push'. However the troops involved will have been very fatigued and probably disrupted by their first attack (especially if deliberate, and the second attack will go much worse (not better). The only time I ever attack the same unit twice with the same attackers is if I hasty attack the first time and only just fail, then I might deliberately attack the second.
There is a lot to this game, and the Torch scenario makes the WA struggle to get attackers in good enough condition to attack at all let alone win (supply, mud, fatigue, low replacements etc). Persist, and you too can improve to the point where any competent player can beat you rather than humiliate you! I can beat the AI on challenging (on attack - they need more help if I am on defence = Germans usually)
I have a cunning plan, My Lord