Chopin's Nocturne No. 2 in E-flat Major, Op. 9, No. 2, is certainly a piece rich in emotion and nuance, often interpreted as expressing deep feelings and a sense of introspection. However, the notion of it explicitly representing a battle between the hero and fate is more of a subjective interpretation rather than a widely accepted programmatic analysis.
This nocturne, like many of Chopin's works, can evoke a range of emotions, from longing and melancholy to triumph and resolve. The contrasting lyrical melodies and intricate harmonies can be seen as a dialogue between different emotional states, which some listeners might interpret as a struggle against external forces, including fate.
The way Chopin uses rubato and dynamic contrasts can indeed create a sense of tension and resolution, possibly mirroring inner conflicts or the push and pull of personal destiny. Ultimately, the beauty of music lies in its ability to evoke different interpretations and emotions in each listener. If you hear a battle against fate in this piece, that interpretation is valid and adds to the richness of the work.