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As the king had failed to hinder the passage of Cyrus's army at the trench, Cyrus himself and the rest concluded that he must have abandoned the idea of offering battle, so that next day Cyrus advanced with less than his former caution.

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Question:

Why did Cyrus and his army conclude that the king had abandoned the idea of offering battle after he failed to hinder their passage at the trench?

Answer (optional):

Cyrus and his army concluded that the king had abandoned the idea of offering battle after he failed to hinder their passage at the trench because they assumed that the king's inability to stop their advance signaled a lack of intention or preparedness to engage in battle. This led Cyrus to advance with less caution than before.