Capt. A.W. Snyder's Company, of Col. Henry's Regiment, was detailed to guard the country between Galena and Fox and Rock rivers, and was surprised on the night of the 17th of June, while encamped in the vicinity of Burr Oak Grove. His sentinels, while on duty, were fired upon by Indians, who did not deem it prudent to continue the attack, but immediately fled. As soon as it was light enough next morning to follow their trail, Capt. Snyder started with his company, but on reaching their camp, found that they had fled on his approach. He redoubled his speed and continued on their trail until he overtook them. Finding that there was no escape, the Indians got into a deep gully for protection, but were soon surrounded, when Capt. Snyder ordered his men to charge upon them. The Indians fired as they approached and mortally wounded one of his men, Mr. William B. Mekemson, a brave volunteer from St. Clair county, (whose father's family afterwards settled in this, Henderson county, all of whom, except one brother, Andrew, a highly respected Christian gentleman, have, long since, gone to meet their kinsman in another world.) Mr. M. being unable to ride, a rude litter was made and men detailed to carry him back to camp, at Kellogg's Grove. The company had not proceeded far before they were attacked by about seventy-five Indians, and two men, Scott and McDaniel, killed, and a Mr. Cornelius wounded. The company was soon formed into line by the aid of Gen. Whiteside, who was then acting merely as a private, and using the precaution of Indians, each man got behind a tree, and the battle waxed furiously for sometime without any serious results, until the Indian commander was seen to fall, from the well directed aim of Gen. Whiteside's rifle. Having now no leader the Indians ingloriously fled, but for some reason were not pursued. Our reporter, however, said that most of the company refused, for the reason that the second term of their enlistment had expired, and they were anxious to be mustered out of service, although the officers were eager to pursue. The company then commenced their march to camp, and on approaching the litter on which Mekemson lay, found that the Indians had cut off his head and rolled it down the hill. Soon after, Major Riley, with a small force of regulars, came up, and after consultation with Capt. Snyder, it was deemed best not to follow the retreating Indians, as their route probably led to the main army of Black Hawk. APPLE RIVER FORT.