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In page Battle of Tours:

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Formed into a phalanx formation, they were able to withstand a cavalry charge better than might be expected, especially as Charles had secured the high ground – with trees before him to further impede any cavalry charges. Arab intelligence failed to discern the reliability and strength of Charles's men (whom he had trained for a decade), but Charles was well aware of the Caliphate's strengths and weaknesses.[citation needed]