Brig. Gen. Barlow's division took position atop Blocher's Knoll hoping to get into a position to deal with the threat of Rodes's division on Oak Hill.
The 25th and 107th Ohio were positioned to the northwest and the 153rd Pennsylvania to the northeast, with the 75th Ohio and a battalion of the 17th Connecticut in reserve.4 guns of Battery G, 4th US Light Artillery held a position atop the knoll behind the 25th Ohio.
Sometime after 3.00pm, Confederate infantry attacked Barlow's division. Having fought off Barlow's sharpshooters, the Confederates infantry ascended the northeast slope of the knoll. The two sides opened fire on each other with Barlow's men taking the worst punishment. Barlow tried to reinforce and shore up his position but with the Confederates pressing their attack the union line broke.
Here we see the moment the 60th Georgia (left background) and 13th Georgia (right background) crest the knoll, firing into the retreating 153rd Pennsylvania (right background) and 25th and 107th Ohio (foreground). The unsupported light artillery of Battery G limber up and gallop from the field.
The retreat turned into a rout and as Barlow tried to rally his men he received a musket wound to his left side. Two soldiers helped carry Barlow until they too were swept up in the rout and dropped him to the ground to be captured by the enemy.

From Osprey Publishing's: The Battle of Gettysburg 1863 (1)

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