To turn and meet his pursuers (who were evidently in contact with him through their scouts) would have meant, so long as he was on this side of the Somme, no chance of retreat in case of defeat. Every mile he went to the north the Somme valley, already a broad expanse of marsh upon his flank, grew broader and more difficult. The decision, therefore, which Edward took at this critical moment, at once perilous and masterly, showed that rapid grasp of a situation which, for all his lack of a general plan during this campaign, this great soldier could boast. In the first place, he himself rides forward no less than twenty full miles to the village of Acheux. He has behind him the whole army strung out in separate bodies parallel to the Somme. Himself, from the head of that long line of twenty miles, commands all that should be done along it. He next orders separate bodies to approach the valley and seek a crossing, first, if possible, up river, then, as they fail, lower and lower down, and each to be ready as it is foiled at each bridge to fall back north in concentration, and to group in gathering numbers further and further down the stream, and near to his place at the head of the line, Acheux. The whole thing is a fine piece of sudden decision, and is at once a combination of the rapidity of the retreat and of the attempt to force the river, in this the fourth week of August 1346, which so nearly brought disaster to the English force. Three days, the 21st, 22nd, and 23rd, were taken up in this manoeuvre. The English flung themselves successively against the bridges: Picquigny, Long Pré, Pont Rémy. The hardest and first push was at Picquigny at the beginning or southernmost of the effort. The body detached for that effort was beaten back. It was the same with the next blow lower down at Long Pré: the same lower down still at Pont Rémy. At no bridge were the English successful. Everywhere the valley was impassable to them, and as they attempted one place after another down the stream with its broadening marshland and now tidal water, to find a traverse seemed impossible. At last, then, upon Wednesday the 23rd of August the whole host was gathered, foiled, round its King at Acheux. He marched on a few miles to BOISMONT, going on his way through Mons, and there, as it chanced, picking up a prisoner who proved invaluable: for that prisoner betrayed the ford. As the English army lay at Boismont that night of the 23rd, the broad estuary of the Somme stretched to the north of them with no more bridges across it, cut or uncut, and apparently no fate but a choice between a desperate action against superior numbers (nor any retreat open) and surrender.