D decided to concentrate their forces against one of these, so they were able to force 2.

If they ever returned, we could concentrate all our forces for one mass attack.

This gave the Germans time to concentrate their forces against him.

However, this might not be a bad thing because the defenders were able to concentrate their force in the city.

But don't we allow them the chance to concentrate their forces?

But why on earth am I supposed to concentrate my forces and launch an attack?

Once there he would concentrate his forces for a strike into Germany.

At any moment the enemy could destroy them quickly by concentrating their forces.

That can be true even when both sides are concentrating their forces on the same terrain.

I don't want to concentrate our force until we know the enemy by name.