Can anyone help me interpret this poem and explain to me how the Civil War and Lincoln are involved?



HUSH'D be the camps to-day,
And soldiers let us drape our war-worn weapons,
And each with musing soul retire to celebrate,
Our dear commander's death.

No more for him life's stormy conflicts,
Nor victory, nor defeat - no more time's dark events,
Charging like ceaseless clouds across the sky.
But sing poet in our name,

Sing of the love we bore him - because you, dweller in camps, know
it truly.

As they invault the coffin there,
Sing - as they close the doors of earth upon him - one verse,
For the heavy hearts of soldiers.

April 14, 1865 - Confederate malcontent John Wilkes Booth shoots President Abraham Lincoln at Ford's Theater in Washington, D.C. Lincoln dies early the next morning; Booth is killed by a posse of federal soldiers on April 26.

Date of Whitman's poem, May 4, 1865.