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But first they have to get there

Rate of speed is important because warfare is inherently geographic in nature. The fundamental military problem in steel panthers is a space-time problem, as Nathan Bedford Forrest succinctly observed "getting there firstest with the mostest." For bushwhacking a platoon of infantry, a platoon of infantry would be best

but against the side/rear armor of an AFV a swift and well armed scout car is the choice that produces the goods
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I like your anaolgy of calvary in the Civil War

Being a CW buff.
The problem is here in modern warfare it does not work.
One pop or two from a ATG then the charge is done! over and done with and altough a valant effort just a big blunder.
Hope your not using 19th century tactics in 20th century warfare.
Remember the poles charging with lances on tanks?