When did the English invade Ire-land? When did they firmly control the island? What was the Act of Union?

When did the English invade Ire-land? When did they firmly control the island? What was the Act of Union?

(1)In 1170—1171, English armies invaded Ireland.
(2)By the end of the 17th century, England firmly controlled the island.
(3)The Act of Union joined Great Britain and Ireland into the United Kingdom.