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As we know on the 20th of April 1916 the Kriegsmarine sent an expeditionary force to Ireland in coordination with a planned national uprising in Ireland against the British. While successful at first their supplies were soon blockaded by the British, dooming the Irish Republic client state and the German expeditionary force to defeat although managing to significantly tie up the British military.
How would no expedition or the expedition being intercepted by the Royal Navy affect the Western Front and Ireland (presumably the Irish wouldn't rise up without German support)?