Still more remarkable was the rapid development of the power of musketry in Spanish hands. At Bicocca the Marquis Pescayra met the attack of a gigantic Swiss battalion by drawing up a number of small squares or squadrons of Spanish arquebusiers in front of his own battalion of pikes. His instructions were that not a shot should be fired without orders, a fact that points to early excellence in what is now called fire-discipline, but that each front rank should fire a volley by word of command and having done so should file away to the rear to reload, leaving the remaining ranks to do the like in succession. The results of this manœuvre were disastrous to the Swiss; and this ingenious method of maintaining a continuous fire of musketry was the law in Europe for the next century and a half. In fact, if it were necessary to fix an arbitrary date for the first really effective use of small fire-arms in the battlefield the day of Bicocca might well be selected. But we must not fail to note concurrently the drill and discipline which made Pescayra's evolution possible. Three years later, at the famous battle of Pavia, this same skilful soldier attempted a still bolder innovation with his arquebusiers, and with astonishing success. Being threatened with a charge of French heavy cavalry (men-at-arms) he deployed fifteen hundred of his marksmen in skirmishing order before his front, who, taking advantage of every shelter and moving always with great nimbleness and activity, maintained a galling fire as the cavalry advanced, and finally, taking refuge under the pikes of the battalions which were drawn up in their support, smashed the unfortunate French as effectively as the English archers at Creçy. In truth, the effect of this daring experiment on military minds in Europe was hardly less than that of Creçy itself. Henry, Duke of Guise,[69] an excellent soldier, was so much struck by its success that he showed how the principle might be indefinitely extended and find ultimate shape, as many years later it did, in the formation of distinct corps of light-infantry. His own attempt to organise such a body in France was however a failure, and the Spanish arquebusiers long held their own as the first in Europe, a proud position which they had most worthily gained.