William ’ s deposition of James was partly driven Motion by his need to control Control and mobilise English military and commercial power , while Louis provided Supply limited material support Supporting to the Jacobites : both sides were aware Know of the Irish war 's potential to divert military resources from the Continent .

The war began Process_start with a series of skirmishes between James ’ s Irish Army , which had stayed Temporary_stay loyal in 1688 , and militia forces raised Cause_change_of_position_on_a_scale by Irish Protestants : they culminated Process_end in the Siege of Derry , where the Jacobites failed Earnings_and_losses to regain Control control of one of the north ’ s key towns .