Season 5 Episodes7
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Sean Barrett
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Ranked #2 of 7 in Season 5•+0.5 vs season avg
The amazing successes and stunning failures of ancient military engineers influence today's weapons and tactics; an ancient Greek weapon is still used on aircraft carriers; rapid-firing Chinese catapult; Hannibal crosses the Alps.

Sean Barrett
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"Impossible Army Machines" is episode 6 of Ancient Discoveries season 5. It scored 7.4/10 from 8 votes, ranking #2 of 7 episodes this season (season average 6.9). It aired on December 1, 2008.