Angle, Saxon and Dane fought endless battles and wasted their blood in endless strife. The next example is Ireland about a century later. Brother fought against brother and clan against clan. Finally, the deposed King of Leinster Dermot MacMurrogh asked the English Roman Catholic king to help him regain his throne. The invaders never left.
Japan is the next example.
First to arrive in Japan were the Jesuits. They were welcomed by the Japanese Emperor. Then followed the Dominicans and Franciscans. These groups soon began to fight among themselves and civil war seemed imminent. This would have meant an invasion of the Spanish or Portuguese to help one side or the other.