What is the purpose of the tone shift in "War is Kind" by Stephen Crane?

The tone shifts in Stephen Crane's "War is Kind" come as a
result of the change in diction.  For instance, in stanza two rather than use the
conversational tone of the other stanzas, Crane chooses to employ more elevated and
Romantic language in the second stanza.  This embellished and
exaggerated style--

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Great is the battle god, great and his
kingdom

A field where a thousand corpses
lie.

is employed by Crane to
show how absurd it is to glorify wars and attach Romantic ideas to them.  For, the
contrast between the field with a thousand corpses lying promiscuously about in crumbled
forms, is much less heroic than any deeds of glory.  In a switch from the second stanza
and its apparent cynicism and mockery, Crane exhibits an ironic sympathy to the victims
and their mothers:

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Mother whose heart hung humble as a
button

On the bright splendid shroud of your
son,

Do not weep.

War is
kind.

There is some comfort
in knowing that the victims of war have found respite from their
suffering.