Why had the men of Umuofia called a meeting?

The men of Mbaino, a neighboring village, had murdered a woman of Umuofia, and the men wanted revenge. The men didn't go to war unless the reason was accepted by the oracle.

Yes, as he found it difficult to comprehend the things he was surrounded by. He was curious about his father, and yet, he was frightened by the things his father was excited to show him. Moon Shadow was uncomfortable and frightened by the electric light, the ear phones, the crystal set, the strangely constructed machines, all of which he believed to be some kind of magic.

"I didn't say anything, but father realized I was scared from the way I was shaking.”