With no explanation, label each line with "location-GPE", "O", "organization-other", "art-broadcastprogram", "art-film", "art-music", "art-other", "art-painting", "art-writtenart" or "building-airport" preceded by ":".
Thus
it
became
a
prime
target
in
1864
as
the
Union
Army
moved
through
Georgia
.
Thus:O
it:O
became:O
a:O
prime:O
target:O
in:O
1864:O
as:O
the:O
Union:organization-other
Army:organization-other
moved:O
through:O
Georgia:location-GPE
.:O