Given the task definition and input, reply with output. In this task, you're given a pair of sentences, sentence 1 and sentence 2. Your job is to determine if the two sentences clearly agree/disagree with each other, or if this can't be determined. Indicate your answer as yes or no respectively.

Sentence 1: This proved highly dangerous to pilgrims who approached the abbey across the sands (the causeway joining the island to the mainland was not built until 1874). Sentence 2: Many pilgrims perished en route to the abbey.
no