In Emily Dickinson's poem They dropped like flakes - what does across the June mean?

First, most of her biographers say this poem was influenced by the Civil War, and she points out the irony of so many sudden deaths, comparing them to other transient things in nature --like flakes, like stars, like petals from a rose. The men were here, and now, suddenly, they are gone. They perished (died) in the seamless grass, and only God knows who they were. The line about "across the June" probably continues with the contrast between the tragic death of the soldiers and the beauty of the month of June, when summer arrives in the east-- the warmth of June contrasted with the eternal coldness of the grave.
First, most of her biographers say this poem was influenced by the Civil War, and she points out the irony of so many sudden deaths, comparing them to other transient things in nature --like flakes, like stars, like petals from a rose. The men were here, and now, suddenly, they are gone. They perished (died) in the seamless grass, and only God knows who they were. The line about "across the June" probably continues with the contrast between the tragic death of the soldiers and the beauty of the month of June, when summer arrives in the east-- the warmth of June contrasted with the eternal coldness of the grave.