At Patrick H's request, my post from another thread:
It is a testament to their defeat that the Federal troops commanded by Lyon, including those fighting physically near him at Oak Hills failed to protect him or to retrieve his body. Instead, they dropped their weapons and fled the field and it was many hours later when they found cover and relative safety in Springfield that they sent out emissaries to Price asking for Lyon's body. Price had argued with McCulloch to join him and chase the Federals north all the way to St. Louis, if necessary to complete their destruction. However, McCulloch refused saying it exceeded his orders.
I've read reports of the disposition of Lyon's body in histories, including Tucker's Westerners In Gray. Apparently, having driven the Yankees off the hill, upon which the main battle had taken place and where Lyon met his demise, the boys wanted to chop up his body and scatter the pieces for the varmints to clean up. Cooler heads prevailed and they carried Lyon's body from the field and left it in repose at a nearby farmhouse for the Federals to collect. Eventually, arrangements were made to convey his body back to his Army, which was in full retreat toward the railhead at Rolla.