Did you know if it is possible to fight night battles in ATW? If so, what do you need to include this feature in a mod?

I have troubles getting night battles in the mod LOTR-TW, using ATW.exe. I have seen that ATW includes the traits noctophobia/noctophilia, so I guess it should be possible.
I have tried adding the trait NightBattleCapable (+1 to night command) and giving it to all characters, but the choice to fight at night still does not appear.
We have also added the command "night_battles_enabled" at the start of the descr_strat.txt. Am I missing something else?
Could someone confirm if he has seen a night battle under ATW?

Thanks in advance.