Johnston chose to attack Grant before Buell arrived. Given that the junction of Grant/Buell would not produce the 3 to 1 ration desired for assault, was a defensive posture considered by Johnston on any of his subordinate commanders.
Was Johnston feeling pressure either from Richmond or from himself to Do something after the withdrawal from Kentucky followed by the abandonment of Nashville.
Was Johnston concerned about being relieved of command if he didn't strike.
We see what happened to the union commander of the army of the Potomac in the peninsula campaign when he was deemed to be too passive that same year.
Was Johnston feeling pressure either from Richmond or from himself to Do something after the withdrawal from Kentucky followed by the abandonment of Nashville.
Was Johnston concerned about being relieved of command if he didn't strike.
We see what happened to the union commander of the army of the Potomac in the peninsula campaign when he was deemed to be too passive that same year.