Courage and conviction are powerful weapons against an enemy who depends only on fists or guns. Animals know when you are afraid a coward knows when you are not.
We can just assume they have much more and powerful more advanced technology all the new computers everything could be much more easier and help them to build much more and many more nuclear weapons.
The anger in the Brigade against those who fought the Republic in the rear was sharpened by reports of weapons even tanks being kept from the front and hidden for treacherous purposes.