Final answer:
The subject in question pertains to historic invasions and explorations, specifically mentioning the Glorious Revolution where the prince of Orange took the English throne, as well as the Norse exploration of North America.
Step-by-step explanation:
The passage references several historical invasions and figures, discussing acts of conquest and exploration. Particularly highlighted is the invasion undertaken by the prince of Orange, which culminated in his family ascending to the throne of England after James had fled the country. This historical context corresponds with the events of the Glorious Revolution of 1688, where William III (William of Orange) invaded England, leading to the overthrow of King James II.
Furthermore, the passages mention the exploratory endeavors of Norse figures, such as Leif Erikson and Eric the Red, suggesting a scope that includes the Norse exploration of North America. The given contexts explore the themes of conquest and exploration with a strong focus on military strategy and the historic relevance of these actions.