Von der Rudesheim had found that the battalion which was engaged with the Grenadiers could not get near Harlow village, or either the river or railway bridge at that place, both of which he wished to destroy. But his scouts had reported a lock and wooden footbridge immediately to the westward between Harlow and Sawbridgeworth, just abreast of the large wooded park surrounding Pishobury House on the farther side. He determined to send two companies over by this, their movements being hidden from the English by the trees. After crossing, they found themselves confronted by a backwater, but, trained in crossing rivers, they managed to ford and swim over, and advanced through the park towards Harlow Bridge. While this was in progress, a large force was reported marching south on the Cambridge Road. While Von der Rudesheim, who was at the western end of Sheering hamlet, was looking through his glasses at the new arrivals on the scene of action--who were without doubt the main body of the Royston command, which was retiring under the personal supervision of Lord Byfield--a puff of white smoke rose above the trees about Hyde Hall, and at top speed four heavily loaded trains shot into sight going south. These were the same ones that had brought down the Regular British troops, with whom he was now engaged. They had gone north again, and picked up a number of Volunteer battalions belonging to the retreating force just beyond Bishop's Stortford. But so long a time had been taken in entraining the troops in the darkness and confusion of the retreat, that their comrades who had kept to the road, arrived almost simultaneously. Von der Rudesheim signalled, and sent urgent orders for his guns to be brought up to open fire on them, but by the time the first team had reached him the last of the trains had disappeared from sight into the cutting at Harlow Station. But even now it was not too late to open fire on the troops entering Sawbridgeworth.