You are referring to all slaves? If that is the case then that is true. It is also true Lincoln's EP did not offer emancipation to all slaves. The CSA governmnt they offered emancipation to those who fought, I am sure their families woul;ld have also been freed, but I have not read anything to that effect.
Now your statement the "CSA leadership did not arm the slaves to preserve the isnstitution of slavery" is still wrong.