support units under fire should auto-exit to defend themselves.
 

e.g. field guns, mortars and machine guns, when they come under fire, they just sit there until they are dead.

why not have an auto 'exit current station, squat and return fire?' facility in the AI?

hi, this is now been changed and it's better but only one unit exits from a 2-man artillery piece or whatever. the other one just stays there. both units should exit if they come under small arms fire.

if you want this to not happen you need to provide infantry cover for your men!