Which famous tune became a "theme song" of the union army during the civil war?

a) lincoln and liberty
b) i wish i was in dixie
c) the battle hymn of the republic
d) when johnny comes marching

mine eyes have seen the glory of the coming of the lord:
he is trampling out the vintage where the grapes of wrath are stored;
he hath loosed the fateful lightning of his terrible swift sword:
his truth is marching on.

glory, glory, hallelujah!
glory, glory, hallelujah!
glory, glory, hallelujah!
his truth is marching on.

i have seen him in the watch-fires of a hundred circling camps,
they have builded him an altar in the evening dews and damps;
i can read his righteous sentence by the dim and flaring lamps:
his day is marching on.

glory, glory, hallelujah!
glory, glory, hallelujah!
glory, glory, hallelujah!
his day is marching on.