At this crisis however France found an unexpected help in a body of German knights. The long strife between Lewis of Bavaria and the Papacy had ended at last in Clement's carrying out his sentence of deposition by the nomination and coronation as emperor of Charles of Luxemburg, a son of King John of Bohemia, the well-known Charles IV. of the Golden Bull. But against this Papal assumption of a right to bestow the German Crown Germany rose as one man. Not a town opened its gates to the Papal claimant, and driven to seek help and refuge from Philip of Valois he found himself at this moment on the eastern frontier of France with his father and 500 knights. Hurrying to Paris this German force formed the nucleus of an army which assembled at St. Denys; and which was soon reinforced by 15,000 Genoese cross-bowmen who had been hired from among the soldiers of the Lord of Monaco on the sunny Riviera and arrived at this hour of need. With this host rapidly gathering in his front Edward abandoned his march on Paris, which had already served its purpose in relieving Derby, and threw himself across the Seine to carry out the second part of his programme by a junction with the Flemings at Gravelines and a campaign in the north. But the rivers in his path were carefully guarded, and it was only by surprising the ford of Blanche-Taque on the Somme that the king escaped the necessity of surrendering to the vast host which was now hastening in pursuit. His communications however were no sooner secured than he halted on the twenty-sixth of August at the little village of Crecy in Ponthieu and resolved to give battle. Half of his army, which had been greatly reduced in strength by his rapid marches, consisted of light-armed footmen from Ireland and Wales; the bulk of the remainder was composed of English bowmen. The king ordered his men-at-arms to dismount, and drew up his forces on a low rise sloping gently to the south-east, with a deep ditch covering its front, and its flanks protected by woods and a little brook. From a windmill on the summit of this rise Edward could overlook the whole field of battle. Immediately beneath him lay his reserve, while at the base of the slope was placed the main body of the army in two divisions, that to the right commanded by the young Prince of Wales, Edward "the Black Prince," as he was called, that to the left by the Earl of Northampton. A small ditch protected the English front, and behind it the bowmen were drawn up "in the form of a harrow" with small bombards between them "which with fire threw little iron balls to frighten the horses," the first instance known of the use of artillery in field-warfare.