I know what's causing it. When your army, led by a general/family member, attacks an enemy army, you may have friendly reinforcements if another army is nearby. In my case rebels had spawned outside my city, so I sent an army to kill them and the reinforcing army from inside the city joined in. On the battle map this unit (just a unit of leves) entered the battle right behind the enemy army, so I clicked "withdraw" to send them back over the red line as I didn't need them.
To clarify, I only withdrew the unit of leves that were not a part of my army - they were reinforcements from the city that I didn't need or want. My actual army, led by a family member, deployed for combat and defeated the enemy army, including the family member who was engaged in the battle from the moment melee combat was joined. First of all his unit and a unit of equites Romani chased away the enemy cavalry and light skirmishers, then turned to charge the rear of the enemy infantry, which routed the enemy army. After that the general and the equites chased down 600-something prisoners.
But after the battle he got "doubtful courage".
It's because I clicked withdraw on the reinforcing unit of leves.![]()









