Can anyone refresh my memory on this? Wikipedia is no help, as I cannot remember the name of the incident, and any search terms would be too wide. I understand it involved attempts by USA troops to insist that only white servicemen were served in the public houses. The British were not happy about this - I believe, but am not certain, that some landlords responded by posting "Black Only" signs.
Matters came to a head with violent disorder, presumably between the Americans and British. I'm scant on details, but I believe it is known as the Battle of X Y.