Arrian, Anabsis 5.15.4-5
In fact, he (Porus) chose to advance against Alexander himself with all his force, and fight to a finish against the strongest part of the Macedonians and their King himself. Even so he left a few elephants behind with a small force there by the camp, to scare the cavalry under Craterus away from the bank. He himself, taking all his cavalry, about four thousand horse, all the three hundred chariots, two hundred of the elephants, and any serviceable infantry, about thirty thousand, advanced against Alexander.
When he found a place that he did not think muddy - it was sandy and therefore all level and solid for cavalry to charge and retire - he drew up his army there, putting the elephants on the front line, not less than a hundred feet apart, so as to form a line in front of the whole phalanx of infantry, and terrify the cavalry of Alexander at all points.
הטקסט והפיסוק מלואב.
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