First:
Testuo, as we´ve been taught in history, the first time Ireland was populated was when the British were worried that the Spanish would take it over as a base to attack Britian from around the time of the Spanish Armada. Though my dad says that it´s been attacked earlier than that..
I believe your history could do with some brushing up.
c 10,000 BC earliest known settlers arrived in Ireland, in the Mesolithic period. They crossed by land bridge from what is now Scotland.
c 600 BC Celts
c 100 BC Gaels
c 300 AD Scoti
c 900 AD Vikings
1167 AD Normans
By ‘taking your country’ I assume you are making some allegory to more recent history say to the 16th and 17th century Plantations, or the Cromwellian conquest, or the Settlement Acts 1652/57/62 or is it the specifically the 1603 plantation of Armagh, Fermanagh, Cavan, Londonderry, Donegal and Tyrone? Maybe the Penal Laws, which denied political and land-owning rights to Catholics and to Presbyterians alike.
As for speaking Irish it was only in the 1840s that Irish collapsed as the dominate language. Guess why? Clue 1845.
As for list of atrocities don't even make me go there, friends and family members are included in some.