How did the battle of bull run reflect the beginnings of a broad pattern of leadership in the North and the South?

The war was fought along a small river called Bull run. The war took the North by surprise and they fled back to Washington. The South had false hope of being able to finish off the South very fast in the war. 3,000 Union from the North and 1,750 Confederates were among the casualties.

The leadership of the North became more troubled than the South due to the surprise attack and started faltering by using much more complex techniques instead of easier and simpler executable strategies.

where is the passage