Well yes and no.
Scotland was an established kingdom of course, but during the time of Wallace the king was a puppet dominated by England and actually Scotland didn't have much of an army to fight with as most of the nobles (the army would be made up of their retainers) refused to fight England as they usualy held fealty for lands in both England and Scotland. Wallace did form a largely highland / peasant army at first until after his early successes some Nobles joined him.
By the time Robert the Bruce took up leadership he had the backing of many more nobles and so Scotland was able to field a far more professional force than under Wallace.
This is a gross simplification but hopefully you get the general idea

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