I think we need to learn some things from our history to better ourselves. Here's some valuable lessons that I've compiled.
From Alexander the Great:
Use types of troops which your opponenet is not used to/expecting. For example, in one of his battles he used heavy cavalry in front of his fortified phalanx to overrun his enemies.
From Napoleon:
Well just about everything that is used in modern warefare, such as increasing marching rates, living off the home country, seperating into specific units, and attack lines of enemy supply. This was seen particularly in the Civil War.
From Phalanx Warfare/Modern Warefare:
I believe that we should combine ancient war techniques with modern ones. Mordern warefare entails of scattered groups of soldiers attack another group of scattered soliders. Usually units move together in 3s-10s. I think that we should figure out a way to protect larger groups of soliders to overwhelm the enemy, as is commonly used by riot police. Each solider will have a bullet proof shield either somehow attached to them or they will hold it and combining the shields will cover the entire unit which will storm the enemy, taking cover when neccesary. If the troops are brave enough, they will move together quickly and take the enemy by surprise.