I see such a metaphor for human forces here: how whatever Pope Urban II and Emperor Alexius had in mind for this holy war/armed pilgrimage, things quickly escalated out of their control and the message and mission as it came to actually be almost swept both men right off their feet. Never underestimate the power of human passion! Although doomed to failure and disaster, the first wave of people (under Peter the Hermit) to attempt the approach to the Holy Land would have important effects on how both the Seljuk Turks and the Byzantine Greeks perceived the following waves—underestimations both groups would later come to regret.