In the poem "Success is counted sweetest," I would like to understand better the idea of the last two lines.

Wow! It must be hard studying the poetry of Emily
Dickinson if English is not your first language. Good on you for doing this! Well, if we
think about the last two lines, they of course relate to the rest of the poem and the
way that the soldier who is described as "defeated--dying" can hear the sounds that the
victorious army are making as they celebrate their success. Note what the last two lines
say:

The
distant strains of triumph

Burst agonised and
clear!

The "distant strains"
here are the distant sounds of triumph that "burst" upon the dying soldier. Of course,
because he is dying in failure, they burst "agonised and clear" to highlight his lack of
victory. However, let us not forget the central irony. It is this dying, defeated
soldier that will understand success better than the victorious army, Dickinson
suggests, as it is he who desires it so badly that "counts" success to be "sweetest." I
hope this helps!