Final answer:
Common ground refers to shared values or objectives within a group. For reconnaissance subgroups, common ground might revolve around strategy and tactics, while for cave subgroups. Cultural perceptions also influence how common ground is understood and established among different groups.
Step-by-step explanation:
The question deals with the concept of common ground as it applies to different subgroups within a larger group. It references reconnaissance subgroups and cave subgroups, suggesting a context of military, social, or strategic organization. In contrast, the common ground for cave subgroups would suggest a reliance on different tactics, such as maintaining steady progress on difficult ground or resorting to stratagem on hemmed-in ground.
From the descriptions of historical and military strategies proposed by the leaders, it appears that the leadership and unity among the subgroups were crucial in establishing common ground. For example, the Vietcong is mentioned as having a strong resolve to fight, which could establish common ground through shared purpose and determination. Similarly, in hunter-gatherer societies, spontaneous leadership may have created common ground through respect for individual skills and personal qualities.
The portion referencing ways various groups of people perceive their cultures differently (WG.16C) implies that the perception of common ground can vary greatly depending on the cultural context and the characteristics being shared or contested within a group.