They are head and shoulders above us wrt army if the IRL is any indication; out Firing Line is several decades outdated.
Plus they may or may not have Massed Battery Fire already online.
Don't underestimate the folks who just steamrolled First Coalition even harder than in OTL.
The two republics' economies are fucked and wrecked.
You cannot have an army if you can't afford to pay, equip, or feed them.