To control an army, one must first throw away the perspective of the individual, and turn into a creature that operates like a hive...
One that can see from multiple different perspectives at a time.
The change in terrain, the survivability of the warriors, the state of morale, the capabilities of the enemies...
One must be able to grasp all of that at once and create an action, or produce a suitable reaction to every change on the battlefield.
"Close the shields! Don't let them get close! Spears, out!" Cain spoke, his voice travelling directly into the ears of all the people present.
Most of them managed to make adjustments in time, while those who didn't quickly became victims and were torn to death.
Once everyone was huddled together, it was only a matter of fortifications...