How did the Ulster rebellion of 1641 increase tensions between Charles I and Parliament?

The Ulster rebellion of 1641 significantly intensified the conflict between Charles I and the Long Parliament by creating a critical crisis of trust regarding military authority.12

Following the outbreak of the rebellion, in which Irish Catholics rose against Protestant settlers, an army was urgently needed to restore order. However, a deep suspicion of the king’s intentions paralyzed the government; Parliament feared that if they granted Charles control over a military force, he would use it to suppress his political opponents in London rather than to quell the insurgents in Ireland.12

This impasse exacerbated existing tensions in several ways:
* Control of the Militia: The crisis led to John Pym and his allies attempting to transfer control of the militia and military appointments from the crown to Parliament.2
* The Grand Remonstrance: Deeply distrustful of the king, Parliament debated the Grand Remonstrance, a catalog of grievances that formally divided the Commons into opposing Royalist and Parliamentarian factions.2
* Breakdown of Diplomacy: Charles’s refusal to accept parliamentary oversight and his subsequent attempt to arrest leading members of Parliament in January 1642 ultimately shattered the remaining confidence between the two sides, leading directly to the outbreak of the English Civil Wars.12