Each side conducts sacrifices in which they ask the gods for assistance in the battle, sometimes they hope that there will be a favorable omen suggesting they're going to win.

双方会各自进行祭祀,祈求神灵的庇护,有时他们希望得到有利的预兆,告诉他们将取得胜利

耶鲁公开课 - 古希腊历史简介课程节选