After the advance towards Paris the duties of the cavalry consisted entirely in scouting the country, sweeping in provisions for their own army, and preventing supplies from entering Paris. No siege operations were undertaken, the king relying upon famine alone to reduce the city. Its population at the time the siege commenced was estimated at 400,000, and the supply of provisions to be sufficient for a month. It was calculated therefore that before the League could bring up another army to its relief, it must fall by famine. But no allowance had been made for the religious enthusiasm and devotion to the cause of the League that animated the population of Paris. Its governor, the Duke of Nemours, brother of Mayenne, aided by the three Spanish delegates, the Cardinal Gaetano, and by an army of priests and monks, sustained the spirits of the population; and though the people starved by thousands, the city resisted until towards the end of August. In that month the army of the League, united with twelve thousand foot and three thousand horse from the Netherlands under Parma himself, advanced to its assistance; while Maurice of Holland, with a small body of Dutch troops and reinforcements from England, had strengthened the army of the king. The numbers of the two armies were not unequal. Many of the French nobles had rallied round Henry after his victory, and of his cavalry four thousand were nobles and their retainers who served at their own expense, and were eager for a battle. Parma himself had doubts as to the result of the conflict. He could rely upon the troops he himself had brought, but had no confidence in those of the League; and when Henry sent him a formal challenge to a general engagement, Parma replied that it was his custom to refuse a combat when a refusal seemed advantageous for himself, and to offer battle whenever it suited his purpose to fight. For seven days the two armies, each some twenty-five thousand strong, lay within a mile or two of each other. Then the splendid cavalry of Parma moved out in order of battle, with banners flying, and the pennons of the lances fluttering in the wind. The king was delighted when he saw that the enemy were at last advancing to the fight. He put his troops at once under arms, but waited until the plan of the enemy's battle developed itself before making his dispositions. But while the imposing array of cavalry was attracting the king's attention, Parma moved off with the main body of his army, threw a division across the river on a pontoon bridge, and attacked Lagny on both sides.