text: The winning general at this battle was able to cross the titular river in secret during the night.
full_question: The winning general at this battle was able to cross the titular river in secret during the night. During fighting the next day, the Macedonians were able to smash the left wing of Porus's army, and Coenus’s cavalry prevented the enemy cavalry from intervening. The elephants fled, leaving the defending army surrounded. Fought in 326 BC in the Punjab region of India, this is for ten points what last and most costly battle fought by Alexander the Great?
first_sentence: The winning general at this battle was able to cross the titular river in secret during the night.