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Mark Pennell sits at the helm of his time machine.Mark's Almanac is a 90-second time travel that highlights the world's history from the very serious to the sometimes sublime.

Mark's Almanac for October 21, 2020

Photo of U.S. Signal Corps. 155 mm artillery cooperating with the 29th Division in position on a road just taken from the Germans.
LIBRARY OF CONGRESS
U.S. Signal Corps. 155 mm artillery cooperating with the 29th Division in position on a road just taken from the Germans.

It was on this date in 1917, Americans were involved in their first World War I battle. And on this date in 1944 , U.S. troops captured the first city inside Germany of World War II, Aachen.