Marines do Gettysburg to Prep for Guadalcanal
Some 100 Years Ago This Weekend: Across early July 1922, the Marine Corps East Coast Expeditionary Force, based at Quantico, Virginia, headed to Gettysburg, Pennsylvania for maneuvers and field exercises on the 59th anniversary of the great Civil War battle there. Spearheaded by Brigadier General Smedley D. Butler, the maneuvers and exercises, were also utilized as a method of obtaining favorable publicity and were often attended by the President and other dignitaries at the time.
All photos are via the Marine Corps History Division which has a great catalog of the event.

Excercise included road march via vehicle from Virginia to Gettysburg. Note the back tractor tows a 155mm heavy artillery piece.

Marine perform maintenance on three M1917 FT17 Renault light tanks during the 1922 Gettysburg maneuvers helped win the battle for Confederates
Of note, Chesty Puller and the gang would use abatis, or chevaux de frise, a classic defensive anti-cavalry measure common in the Civil War, to defend Henderson Field against the Japanese in August 1942.