Startups - Concentrate Your Resources!

I was watching a documentary about the "101st Airborne" - a tough paratroops division - on the Military History channel today, and it suddenly struck me that a startup usually has to act like shock troops rather than a regular army. By definition, a startup has a small amount of resources. The reason shock troops succeed is by applying a large amount of force targeted at a point or a small area so that they can overwhelm a much larger enemy at that point and break through. This is the principle of concentrated resources.