Records are showing and the Article states that Lawson enlisted in the 8th Regt Missouri Volunteer Cavalry on July 5th 1862.
According to Card #691 Missouri Adjutant General
Lawson, Geo D. was enlisted on 7/5/1862 at Springfield Mo as a Bugler (Pvt) in Co E at the age of 18 (I have no doubt that he fudged the age)
Promoted to Bugler (Cpl) on Oct 1 1864
He served until 7/20/1865 when he was mustered out at Springfield.
His enlistment date would put him too late to take Part in the Wilsons Creek Battle of 8/10/1861. Unless he had attached himself to a unit prior to his enlistment. To take part in that battle. I can find no record of a George Lawson on any other muster roll prior to July of 1862. It is possible though not probable that he did attach himself given the proximity of Fordland to the Battle.
Also enlisting in the 8th Mo Vol Cavalry was a William H. Lawson Sgt. Company E.
According to Card #692 Missouri Adjutant General
W.H. Lawson enlisted at Marshfield Mo. 7/28/1862
Mustered in at Springfield 8/28/1862
Died at Memphis TN 9/14/1863 at the General Hospital and was buried in the Mississippi River National Cemetary. Maybe a relative?
While I do not doubt that Lawson served at Pea Ridge and later throughout the Trans-Miss I find the Wilsons Creek claim iffy and also the Sherman claim. The 8th Mo Vol
Cav served mainly in the Dept. of Arkansas in the 7th Army Corps and prior to that in the Army of the Frontier. They never crossed the river except for their sick and wounded.
There is also a Missouri Adjutant General Card #705 for a William H. Lawson
Enlisting in White Oak 6/10/1861 mustering to State Service same date in Webster County Home Guards. Company E.
Mustered out 8/11/1861 the day after the Battle of Wilson's Creek.
The Webster County Home Guards were activated by General Lyon and were serving in the Springfield/Republic area during Wilsons Creek. While there is no evidence that the Webster County Home Guard was in eithier Lyon's or Sigels columns they may well have engaged State Guard units during the battle and covered the retreat. Perhaps this is the Lawson of Wilson's Creek.