Black Hawk was foolish enough to send a message of defiance to General Atkinson, and, retreating up the Rock, he came to a stand at Stillman's Creek. Here he repented, and sent out runners with a flag of truce, to inform the white chief that he would surrender; but the drunken pickets of the militia advance wantonly killed these messengers of peace. This so angered the Hawk that with a mere handful of thirty-five braves, on foot, and hid in the hazel brush, he turned in fury upon the two hundred seventy-five horsemen who were now rushing upon him. The cowardly rangers, who fled at the first volley of the savages, without returning it, were haunted by the genius of fear, and, dashing madly through swamps and creeks, did not stop until they had reached Dixon, twenty-five miles away. Many kept on at a keen gallop till they reached their own firesides, fifty or more miles farther, carrying the absurd report that Black Hawk and two thousand bloodthirsty warriors were sweeping northern Illinois with the besom of destruction.
Rich in supplies captured in this first encounter, and naturally encouraged at the result of his valor, the Hawk thought that so long as the whites were determined to make him fight, he would show his claws in earnest. Removing the women and children to far-away swamps on the headwaters of the Rock River, in Wisconsin, he thence descended with his braves for a general raid through northern Illinois. The borderers flew like chickens to cover, on the warning of the Hawk's foray. There was consternation throughout the entire West. Exaggerated reports of his forces, and of the nature of his expedition, were spread throughout the land. His name became coupled with fabulous tales of savage cunning and cruelty, and served as a household bugaboo the country over. The effect on the Illinois militia was singular enough, considering their haste in taking the field; in a frenzy of fear, they instantly disbanded!
A fresh levy was soon raised, but in the interval there were irregular hostilities all along the Illinois-Wisconsin border, in which Black Hawk and a few Winnebago and Pottawattomie allies succeeded in making life miserable enough for the frontier farmers of northern Illinois and the lead miners of southwest Wisconsin. In these border strifes fully two hundred whites and nearly as many Indians lost their lives; and there were numerous instances of romantic heroism on the part of the settlers, men and women alike.
In about three weeks after Stillman's defeat the reorganized militia took the field, reënforced by the regulars under Atkinson. Black Hawk was forced to fly to the swampy region of the upper Rock; but, when the pursuit became too warm, he hastily withdrew with his entire band westward to the Wisconsin River. Closely following upon his trail were a brigade of Illinois troops under General James D. Henry, and a battalion of Wisconsin lead mine rangers under Major Henry Dodge, afterwards governor of Wisconsin Territory.
The pursuers came up with the savages at Prairie du Sac. Here the south bank of the Wisconsin consists of steep, grassy bluffs, three hundred feet in height; hence the encounter which ensued is known in history as the Battle of the Wisconsin Heights. With consummate skill, Black Hawk made a stand on the summit of the heights, and with a small party of warriors held the whites in check until the noncombatants had crossed the broad river bottoms below, and gained shelter upon the willow-grown shore opposite. The loss on either side was slight, the action being notable only for the Sac leader's superior management.
During the night, the passage of the river was accomplished by the fugitives. A large party was sent downstream upon a raft, and in canoes begged from the Winnebagoes; but those who took this method of escape were brutally fired upon near the mouth of the river by a detachment from the garrison at Prairie du Chien, and fifteen were killed in cold blood. The rest of the pursued, headed by Black Hawk, who had again made an attempt to surrender his forces, but had failed for lack of an interpreter, pushed across country, guided by Winnebagoes, to the mouth of the Bad Ax, a little stream emptying into the Mississippi about forty miles above the mouth of the Wisconsin River. His intention was to get his people as quickly as possible on the west bank of the Mississippi, in the hope that they would there be allowed to remain in peace.
The Indians were followed, three days behind, by the united army of regulars, who steadily gained on them. The country between Wisconsin Heights and the Mississippi is rough and forbidding in character; there are numerous swamps and rivers between the steep, thickly wooded hills. The uneven pathway was strewn with the corpses of Sacs who had died of wounds and starvation; and there were frequent evidences that the fleeing wretches were sustaining life on the bark of trees and the flesh of their fagged-out ponies.
On Wednesday, the 1st of August, Black Hawk and his now sadly depleted and almost famished band reached the junction of the Bad Ax with the Mississippi. There were only two or three canoes to be had, and the crossing of the Father of Waters progressed slowly and with frequent loss of life. That afternoon there appeared upon the scene a government supply steamer, the Warrior, from Fort Crawford (Prairie du Chien), at the mouth of the Wisconsin. The Indians a third time tried to surrender, but their white flag was deliberately fired at, and round after round of canister swept the camp.