With no explanation, label each line with "person-soldier", "O", "location-other", "art-broadcastprogram", "art-film", "art-music", "art-other", "art-painting", "art-writtenart" or "building-airport" preceded by ":".
While
Taylor
was
encamped
on
the
outskirts
and
preparing
for
his
attack
against
the
city
,
he
learned
that
Port
Hudson
had
fallen
.
While:O
Taylor:person-soldier
was:O
encamped:O
on:O
the:O
outskirts:O
and:O
preparing:O
for:O
his:O
attack:O
against:O
the:O
city:O
,:O
he:O
learned:O
that:O
Port:location-other
Hudson:location-other
had:O
fallen:O
.:O