The signing of the Anglo Irish agreement was a matter of huge contention at the time and it's effects are still seen to this day. So polarising was the decision to sign, brothers who fought together in the Irish War of Independence turned against each other in the ensuing Irish Civil War. The lead negotiator Michael Collins believed that the treaty would allow Ireland "the freedom to achieve freedom." He was shot and killed in an ambush in West Cork, August 1922.
To learn about Michael Collins, click here.
For more background on the Treaty, click here.