Point out examples of the "isms" used in the novel The Red Badge of Courage.The "isms" are romanticism, realism, naturalism, impressionism,...

ROMANTICISM.  The romance of
war leads Henry to enlist in the first place, as it did many soldiers during the Civil
War. The supposed glory that would be found in battle was a lure to many young men who
thought it was a way to prove their
bravery.

REALISM.  Crane
describes his story in very realistic terms. Blood, wounds, death and dying are all
about Henry, and when he sees his comrades shot down before him, the fears he has
concerning his own bravery are
tested.

SYMBOLISM.  One
example comes in the form of the Cheery Soldier, who represents a god-like presence who
saves Henry in the middle of the night and guides him to safety before disappearing into
the darkness.

NATURALISM. 
Crane's novel is deep-rooted in the naturalistic vein, with a large proportion of the
narrative dealing with Henry's inner thoughts and fears. Crane strongly adheres to Emile
Zola's doctrine concerning naturalistic fiction:

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Zola claims that the naturalist writer should
subject believable characters and events to experimental conditions. In other words,
take the known (such as a character) and introduce it into the unknown (such as an
unfamiliar place). 

Henry is
placed on the field of battle, where he faces the unknown--both from the actions of the
Confederate "dragons" who attack him, as well as from his own personal demons that he
must conquer as
well.

IMAGISM.  Although
Imagism primarily was a movement involving poetry, Crane encompasses several of the
primary themes: War, sense of place, and
nature.

IMPRESSIONISM. 
Crane's The Red Badge of Courage is an American classic of stream
of consciousness impressionism, and the novel is one of the earliest examples of the
style. Impressionism in literature

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... can basically be defined as when an author
centers his story/attention on the character's mental life such as the character's
impressions, feelings, sensations, thoughts and emotions, rather than trying to
interpret them. 

The style
allows the reader to decide for himself about the character, giving each reading the
possibility of many different interpretations.