In 1554 the MacNeills relinquished their Gigha holdings to the MacDonalds, but if anything the conflicts intensified. In 1567 Gigha was "ravaged" by the Macleans of Duart. By 1587, atrocities committed between warring West Highland clans had escalated to such an extent that Parliament devised what is known as the "General Band" in an effort to quell hostilities. Despite the Governments actions to secure the peace, about this time Lachlan Mor MacLean of Duart ravaged the MacDonald islands of Islay and Gigha, slaughtering 500—600 men. Maclean of Duart then besieged Angus MacDonald of Dunivaig and the Glens at his Castle Dunivaig on Islay.