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During battle, generals would frequently ask seers at both the campground (a process called the hiera) and at the battlefield (called the sphagia). The hiera entailed the seer slaughtering a sheep and examining its liver for answers regarding a more generic question; the sphagia involved killing a young female goat by slitting its throat and noting the animal's last movements and blood flow. The battlefield sacrifice only occurred when two armies prepared for battle against each other. Neither force would advance until the seer revealed appropriate omens.[citation needed]