30th July 1918
Western Front
Strong German resistance all along line. At St. Euphraise (south-west of Reims) German counter-attack fails. Remigny captured.
Eastern Front
German Field Marshal Hermann von Eichhorn, the military governor of Ukraine, is assassinated by Boris Donskoy, a member of the Left Socialist Revolutionaries.
Aviation
Frank Linke-Crawford, Austro-Hungarian ace with 27 victories, is killed in action over Italy.
Political, etc.
Onondaga Indians declare war on Germany.
Ship Losses:
HMS Stock Force (Royal Navy) The Q-ship was torpedoed and damaged in the English Channel 25 nautical miles (46 km) west of Start Point, Devon (49°49′N 3°53′W) by
SM UB-80 ( Kaiserliche Marine). She counter-attacked and severely damaged
SM UB-80, earning her commander Harold Auten a Victoria Cross.
HMS Stock Force later sank in Bigbury Bay.