They persevered in their efforts until most of them had fallen.

The rest bore the terrible news to the army that the bridge was immovable.
A terrible cry of despair arose, as the news spread.

All hope seemed lost and, regardless of order or discipline, all pressed forward to endeavor, in some way or other, to cross the obstacle that barred their way.
Pressed on by those behind them, Sandoval and his cavaliers dashed into the water.

The distance was short, but the horses were weak from hunger, and burdened by their own heavy armor and that of their riders.

Some succeeded in swimming across.