What armament and devices that were used by the enemies or your era did you fear the most? ear
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Biggest challenge of course, was other tanks. Then there was Napalm, or versions thereof..
The opening scene of the video I posted shows and uneasy couple seconds in any tanker's journey.. that's when cresting a sharp slope and exposing the "soft underbelly' for a few seconds. Rocket launchers of the time could really play havoc there. Bottom plates were about 1" thick..whereas the turrets & frontal armor was from 3 to 5 inches thick.
Below, the models I served in; either one would probably last about 45 seconds..were it pitted against today's Abrams tank: