Answer:
Step-by-step explanation:
"The great difference in mobility between the fast forces and the follow-up infantry" refers to the significant contrast in speed or movement ability between the highly mobile, fast-moving forces (such as armored vehicles, tanks, or helicopters) and the infantry units that follow behind them on foot. This difference in mobility can impact the military strategy and tactics used in a given situation, as the fast forces may be able to move quickly to outflank or surround an enemy, while the infantry may need to move more slowly to keep up and provide support.