His purpose was to persuade fellow delegates to adopt a defensive stance against Great Britain.
Explanation:
On March 23, 1775, Patrick Henry delivers "give me liberty, or give me death" speech after putting forward a resolution proposing that Virginia’s counties raise militiamen for securing their liberties and rights from Grate Britain's continuous violations. After Thomas Jefferson and Richard Henry Lee both lent their support, the resolution passed by only a few votes.
His purpose was to convince the delegates to secede from Britain, and to fight back against them. He antagonizes Britain by imputing every hardships they faced to Britain.