Greeks spotted them inside the Carthaginian camp from Himera and signaled Gelo.

Entity and relation annotations:
id: 0
type: entity
value: text: Greeks
labels: <Organization>
id: 1
type: entity
value: text: Carthaginian camp
labels: <Location>
id: 2
type: entity
value: text: Gelo
labels: <Organization>
id: 3
type: entity
value: text: Himera
labels: <Location>
type: relation
to_id: 3
labels: Location:located_in:Location
from_id: 1