‘And the people, the men of Israel, made themselves strong.'
This may indicate that they brought up further reinforcements as a result of messengers going back to the main force with an indication of what had happened. It may also indicate that many men who had seemed fatally struck down had not been so, and had been brought back to camp ready for further battle.
‘And set the battle again in array in the place where they set themselves in array the first day.'
They still considered that their tactics of the first day had been right. So they once again set their forces in array ready for a further battle. But first they wanted confirmation from Yahweh.