Final answer:
The Confederates' last effort at Gettysburg was Pickett's Charge, a significant event in the battle.
Explanation:
Pickett's Charge was the Confederates' last ditch effort on the third day of the Battle of Gettysburg. Approximately 12,500 Confederate men marched across open fields towards the Union lines, faced heavy artillery and gunfire, breached the Union lines at the 'High Watermark of the Confederacy,' but were ultimately repelled with significant casualties.
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