Battle of Gettysburg. 
Lithograph by L. Prang & Co., 1887. 

LC-USZC4-1178. Library of Congress

In the left foreground a row of Union soldiers kneel, loading or firing their rifles.  In the center foreground, an officer on a dark horse is leading a charge.  Behind him can be seen other soldiers on horseback.  To the officers right, other soldiers on horseback advance toward the troops, including a wagon carrying a cannon.  The right rear wheel of the wagon has just struck a rock, snapping the axle from the wagon. 

To the right of the wagon, a soldier lies on his back, head lifted, watching the wagon.  To his right lie a dead horse with his rider.  At the far right is another wagon, one wheel having fallen off the axle, a dead horse beside the wagon.

In the near background is a line of Confederate soldiers, some firing rifles, others working cannon.  There is a haze of gunsmoke floating over the Confederate lines.    In the distance can be seen other palls of smoke indicating various smaller skirmishes.