Killing Groups

[Imp]

Shifting gears then, how do most people "launch an assault?"

Err it depends on the country hence equipment terrain vision disposition of enemy forces if you are playing as an infantry mech or armoured force so about 20 diffrent ways.

exploit the gap with highly mobile units

Besides it sounds like you are playing the wrong game was done to a small extent in WW2 but more often than not the dangerous way as in armour only outrunning or not even attempting to take infantry with them which is why it was employed more on the defence behind your main lines. That way you did not run into an infantry ambush. Generalising but fast mobile strike forces are a MBT thing as they have the vehicles to do it good radios etc etc.