Tanks were actually mis-used in the early 19th century until generals figured out the proper tactics. At first,
everyone (not just the generals) figured that a tank would be an awe-inspiring terror on the battlefield and it would take just a few to rout an enemy composed of footsoldier or traditional cavalry.
But they discovered that it was
far to easy to swarm and disable the tanks. Heck, even a simple sledgehammer, applied at the right place on the tracks, would knock a tank out.
The best application of tank warfare they discovered was to attack en masse. 50, or 100, tanks lined up or in a "fighting wedge," in mutually supporting distance.
Wodan
ps Saw an hour-long documentary on the history of tanks on the History Channel (or was it the Military Channel).