Empire Total War 2017-01-08

I've had enough of the Maratha confederacy and I started my invasion of India yesterday. This region will be the hardest to conquer.

Empire Total War 2017-01-07 possible glitch

One of my favourite artillery weapons is the howitzer.  Unlike a cannon it fires a projectile up into the air which then falls down on the enemy, particularly useful is the carcass shot option where the projectile explodes over the enemy and rains burning shrapnel and quicklime over them.  This is particularly useful when besieging fortifications, where it is possible to kill the defenders of the walls without destroy the walls.  However therein lies the problem, if it was me defending I would move my troops off the walls to a position out of range of the howitzer.  However when the computer unit is defending it refuses to move its troops off the walls and if an unit is destroyed it moves another one in to replace it.  So after I have destroyed enough defending units I will move my infantry to scale the walls and take the citadel with minimal loss of life.  I wonder if other players have come across this.