War is more like 70% strategy 20% exp. and 10% luck.It doesn't matter how experienced a general/strategist is,if the other person can just outsmart you.No matter how many wars you've fought in,if you can't strategise you will be defeated.Luck isn't a factor someone can change,and the bests of genrals know how to make the most out of luck,even bad luck.
Technology is out of the question since it would be 95% tech 5% strategy.No matter how many troops you have,no matter how well trained they are,no matter how good you are in strategising,if the enemy has a nuke you're screwed.