With no explanation, label each line with "location-GPE", "O", "person-politician", "event-attack/battle/war/militaryconflict", "art-broadcastprogram", "art-film", "art-music", "art-other", "art-painting" or "art-writtenart" preceded by ":".
The
Ionians
are
reported
to
have
served
with
the
Persian
forces
which
were
defeated
at
Marathon
by
the
Athenians
and
Plataeans
in
490
,
while
they
also
fought
on
the
Persian
side
during
Xerxes
'
great
Second
Persian
invasion
of
Greece
of
480-479
.
The:O
Ionians:O
are:O
reported:O
to:O
have:O
served:O
with:O
the:O
Persian:location-GPE
forces:O
which:O
were:O
defeated:O
at:O
Marathon:location-GPE
by:O
the:O
Athenians:location-GPE
and:O
Plataeans:location-GPE
in:O
490:O
,:O
while:O
they:O
also:O
fought:O
on:O
the:O
Persian:location-GPE
side:O
during:O
Xerxes:person-politician
':O
great:O
Second:event-attack/battle/war/militaryconflict
Persian:event-attack/battle/war/militaryconflict
invasion:event-attack/battle/war/militaryconflict
of:O
Greece:location-GPE
of:O
480-479:O
.:O