In the field, we would dig our fighting holes close enough to where we could communicate with each other on either side and spaced far enough to where a single attack by a mortar would not cause multiple casualties. The leader's fighting hole would be further back, but would have full view of where the teams set in so that the leader can go and communicate with the team as necessary in the heat of battle.

Just as preparing for combat in the field, in IT we need the right hand and the left hand to know what each is doing. If we can consider a local business unit as a platoon in my preceding example, comparatively we can add to the complexity of an enterprise to a battalion, regiment, or brigade.