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For 1918 could the Allies have put together a sort of cavalry-mechanized group for their Hundred Days offensive? The Soviets were able to make use of them quite effectively in 1944-45, including in the Manchurian Offensive.
Clearly tanks won't be an option for exploitation due to the technology issues, but how about motorized infantry+towed artillery and armored cars coupled with artillery after 'shock' army of tanks+heavy artillery+infantry have ruptured the German force lines, like at Amiens in August 1918?
British armored cars and cavalry were important to the Palestine Offensive, which is often considered a proto-'Blitzkrieg': https://en.wikipedia.org/wiki/Southern_Palestine_Offensive