Help with Ted Hughes' poem "horses"!!?

This is pre-dawn when everything is still, no birds and the whole of the world frozen in the frost - nothing moves. The horses echo this without making a sound. They are still cast like, 'tortuous statues' hung in the stillness just like the poets breath. And later when the poet is in the crowded streets of a city the horses bring back that stillness. In the middle of chaos the poet can retrieve what he felt at that moment when all the world was new, and still, and beautiful, 'their hung heads patient as the horizons'.