Describe at least three clues in the first seven chapters that suggest that the village of Umuofia values peace above war

I can provide you with one. Consider chapter 2. The narrator tells us that in fairness to Umuofia, it should be said that the village never went to war without first trying a peaceful settlement, and even then it only went if the war was approved by the Oracle of the Hills and the Caves. And the Oracle often forbade war.