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 ":".
During
the
Gothic
War
the
town
served
the
Goths
(
537
and
549
)
and
the
Byzantines
(
546–552
)
as
a
base
of
operations
against
Rome
.
During:O
the:O
Gothic:event-attack/battle/war/militaryconflict
War:event-attack/battle/war/militaryconflict
the:O
town:O
served:O
the:O
Goths:O
(:O
537:O
and:O
549:O
):O
and:O
the:O
Byzantines:O
(:O
546–552:O
):O
as:O
a:O
base:O
of:O
operations:O
against:O
Rome:location-GPE
.:O