In 1542
A Peasant Rebellion known as the Dacke War broke out in Sweden. The Swedish Army, led by the Father-in-Law of King Gustav Vasa himself was defeated by the rebels. The rebels were only defeated after being starved out and having their morale lowered with propaganda.
I understand that you don't understand how armies worked in this time period, but Peasants are where you are drawing your own armies from. Until you have actually invested in training, through Ideas, Policies, Advisors, and Sweden's absurdly overpowered bullshit modifiers, your armies are themselves just as much a horde of peasants with barely any actual training as the rebels.
This is not the age of Professional Soldiers, well actually it is, but that's done by mercenaries.