With no explanation, label each line with "location-GPE", "O", "event-attack/battle/war/militaryconflict", "art-broadcastprogram", "art-film", "art-music", "art-other", "art-painting", "art-writtenart" or "building-airport" preceded by ":".
Built
between
1808
and
1812
to
protect
the
city
from
attack
by
sea
,
it
was
one
of
several
Confederate
forts
defending
Savannah
from
Union
forces
during
the
Civil
War
.
Built:O
between:O
1808:O
and:O
1812:O
to:O
protect:O
the:O
city:O
from:O
attack:O
by:O
sea:O
,:O
it:O
was:O
one:O
of:O
several:O
Confederate:O
forts:O
defending:O
Savannah:location-GPE
from:O
Union:O
forces:O
during:O
the:O
Civil:event-attack/battle/war/militaryconflict
War:event-attack/battle/war/militaryconflict
.:O