Inconceivable Solemn

What is poet Emily Dickinson describing in this poem I've turned into a song? Is it soldiers marching off to the American Civil War? Or is it just maybe a partisan political campaign march in time that her country's political failure was leading it to that war? There's more on this, and over 800 other combinations of various words (mostly literary poetry) with original music in differing style at our blog and archives located at frankhudson.org