In April 1916, Easter Rising took place. Republicans and nationalists took up arms, to drive the British out of the territory. The easter rising is an egalitarian revolt that called both women and men to take up arms.
The event took place only in Dublin, they lasted only six days in the capital and resulted in about 4000 dead and more than 2600 injured, most of whom were civilians, thus marking the Irish collective memory.
That's why the Irish flag took all its importance during this rebellion. The significance of these three colors is strong and this is certainly the reason for its adoption as the national flag. The green represents the Irish tradition and nationalism, the orange symbolizes the Protestant minority, and finally, the white is a sign of peace, reconciliation and brotherhood between the two communities. The British government wanted to avoid recurrence, so they treated the case harshly and handed down 90 death sentences, including that of the leaders of the uprising. For the Irish, this was one of the first steps towards the independence of their country.