If the only danger to be apprehended by the North Germans had been the march of Tilly's army, it is not unlikely that the war would here have come to an end. Ferdinand and Maximilian would doubtless have respected the agreement of Mühlhausen, and there would hardly have been found sufficient determination in the northern princes to induce them to arm for the recovery of the Palatinate. But a new danger had arisen. Mansfeld and Christian had not laid down their arms when Frederick dismissed them in July, and so far from being ready to make sacrifices for peace, they were ready to make any sacrifices for the sake of the continuance of the war. [Sidenote: 1622. § 6. They establish themselves in Lorraine.] It was not long before the adventurers were forced to leave Alsace. They had eaten up everything that was to be eaten there, and the enemy was known to be on their track. Throwing themselves into Lorraine, they settled down for a time like a swarm of locusts upon that smiling land. But where were they to turn next? The French government hurried up reinforcements to guard their frontier. That road, at all events, was barred to them, and Christian, whose troops were in a state of mutiny, tried in vain to lead them towards the Lower Rhine. Whilst the leaders hardly knew what to do, they received an invitation to place themselves for three months at the disposal of the Dutch Republic. [Sidenote: § 7. Battle of Fleurus.] Matters had not been going well with the Dutch since the re-opening of the war in 1621. Their garrison at Juliers had surrendered to Spinola in the winter, and the great Spanish commander was now laying siege to Bergen-op-Zoom, with every prospect of reducing it. To come to its relief Mansfeld would have to march across the Spanish Netherlands. On August 28 he found Cordova on his way to Fleurus, as he had stood in his way in the Palatinate the year before. Worse than all, two of his own regiments broke out into mutiny, refusing to fight unless they were paid. At such a time Mansfeld was at his best. He was a man of cool courage and infinite resource, and he rode up to the mutineers, entreating them if they would not fight at least to look as if they meant to fight. Then, with the rest of his force, he charged the enemy. Christian seconded him bravely at the head of his cavalry, fighting on in spite of a shot in his left arm. Three horses were killed under him. The loss was enormous on both sides, but Mansfeld gained his object, and was able to pursue his way in safety. [Sidenote: § 8. Christian loses his arm.] Christian's arm was amputated. He ordered that the operation should be performed to the sound of trumpets. 'The arm that is left,' he said, 'shall give my enemies enough to do.' He coined money out of the silver he had taken from the Spaniards, with the inscription '_Altera restat_.' [Sidenote: § 9. Mansfeld in Münster and East Friesland.]