Final answer:
Historically, individuals who could not keep up with a military march were usually left behind without support, facing potentially dire consequences.
Step-by-step explanation:
In historical contexts such as military marches, those who could not keep up with the march faced harsh consequences. The specific outcome could vary depending on the situation and the military unit's policy. For example, during the advance of Sherman's army, those who couldn't keep up were typically left behind and had to fend for themselves, which could be a dire situation. In other historical instances, such as the German advance on Moscow during World War II, the troops faced supply shortages and harsh conditions that could leave the physically weak to perish. Historical accounts do not typically mention these individuals being given additional supplies, exempted from further marching, or provided with transportation.