Why were the 6 tribesmen arrested in Things Fall Apart?

In Chinua Achebe's novel "Things Fall Apart," the six tribesmen were arrested for participating in the killing of a colonial messenger. This act was a response to the increasing tensions between the Igbo community and British colonial authorities, as the tribesmen sought to defend their traditions and resist the encroachment of colonial rule. Their arrest symbolizes the broader conflict between indigenous cultures and colonial powers during that era.