Describe a noteworthy moment in the Battle of Gettysburg. please help!

After a year of defensive victories in Virginia, Lee’s objective was to win a battle north of the Mason-Dixon line in the hopes of forcing a negotiated end to the fighting. His loss at Gettysburg prevented him from realizing that goal. Instead, the defeated general fled south with a wagon train of wounded soldiers straining toward the Potomac. Union general Meade failed to pursue the retreating army, missing a critical opportunity to trap Lee and force a Confederate surrender. The bitterly divisive war raged on for another two years.

most of the knowledge we have of the conflict comes from roman-jewish scholar titus flavius josephus, who first fought in the revolt against the romans, but was then kept by future emperor vespasian as a slave and interpreter.