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document updated 20 years ago, on Jul 19, 2005
Megaton
and
Year without a summer
Columbian Exchange
(also, the
Chronometer
, the lack of which created the confusion between the
West-
and
East-Indies
)
progression of
fixed siege warfare
to the bypass of the
Maginot Line
by the german
Blitzkrieg
, and from
Napoleonic field artillery
(and
semaphore communication
) to
mortars
and radio communication