 Complete the following phrase:  On May 17th, Cockrells brigade was part of a force defending the crossing of the Big Black River. It was on the Confederate right, between a body of water named Gin Lake and Brigadier General John C. Vaughns brigade. The 5th Missouri Infantry was positioned to the right of the 4th Mississippi Infantry Regiment. While the 5th Missouri Infantry repulsed a Union probing attack, a Union charge quickly routed Vaughns brigade, exposing the flanks of the rest of the Confederate line. The Missourians were unaware that Vaughns line had broken, and were surprised to receive orders to retreat. After the 4th Mississippi Infantry routed, the 5th Missouri Infantry was in a very exposed position and also routed, with the men racing across the river crossing. After the defeat at 