Why under Napoleon french armies spread revolutionary ideas across Europe but the nationalism they fostered held the seeds of defeat for the emperor?

Under Napoleon, French armies spread revolutionary ideas such as liberty, equality, and fraternity, which inspired various nationalist movements across Europe. While these ideas initially helped to unify and mobilize support for French expansion, they also ignited a sense of national identity and self-determination among conquered peoples. This burgeoning nationalism ultimately turned against Napoleon, as occupied nations began to resist French control and seek their independence, leading to widespread uprisings and ultimately contributing to his downfall. Thus, the very revolutionary principles he championed sowed the seeds of his defeat by empowering other nations to challenge his rule.