The Irish Civil War (February 10, 1919-July 7, 1920) was a conflict in the Kingdom of Ireland, between the armies of King Iaoichim I of Ireland, the Irish Parliementary Army, and the Free State of Ulster.
In 1916, After the Easter Uprisings, Germany sent military aid to the Irish rebels, on the condition that Ireland become a Kingdom, under the Von Hohenzollern dynasty. Many of the Irish Nationalists were unhappy with this arrangement, but agreed nonetheless. By 1918, the United Kingdom was losing the war in Europe, and was running out of men. So a armistice in Ireland was held, and the United Kingdom agreed to withdraw from Ireland, but insisted on an independent protestant nation in Ulster, called the free State of Ulster.
The Treaty of Wexford:
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As per the agreement with Germany, Ireland became the Kingdom of Ireland, with Joachim Franz Humbert Von Hohenzollern at its head. Now, why did the Germans pick this man for the crown of Ireland? Mostly to get rid of him. Joachim Franz Humbert Von Hohenzollern was a liberal, romantic nationalist, who advocated for the ideology of "Antiromanism", which believes that the nations that claim descent from ancient Rome (France, Britain, Italy, etc.) had violently opressed the "Noble Barbarian races" which included the Germans (duh), the Celts, the Slavs, and even the Jews, which he added during his stint as the Govenor of the Mandate of Palestine from 1923-25.
Many Catholic Irish were angry at having a Protestant king, and even the Protestant Irish didn't like the idea of a German as the absolute ruler of their country. To appease the Catholic majority, Iaoichim declared war on the Free State of Ulster. At the same time, a group of dissatisfied nationalists crowned Searlas III the High King of Ireland. They raised their banner in Galway, and almost the etire province of Connacht declared itself in favor of Searlas. They drafted a new constitution, which created a limited monarchy, with Eamon De Valera as Prime Minister. Soon, All of Ireland was at war.
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Joachim I asked he German government for aid, but they were busy with the civil war in France, and could not spare any men. Soon his armies in Ulster defected, and as the Ulster Protestants retreated to Belfast, the Irish Parliementary forces marched south, and took Dublin in March 1920. With popular uprisings, guerilla warfare, and mass desertions, king Iaoichim was soon defeated.
The fromt lines as of the Armistice of July 7th, 1920:
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I hope you all like this, in particular, youmight want to build on the idea of Antiromanism