This monument, dedicated on September 11, 1889, marks the area the 105th Pennsylvania Infantry was positioned along with the rest of General Charles K. Graham's III Corps brigade on the Second Day of the Battle of Gettysburg (July 2, 1863). The unit, commanded by Colonel Calvin A. Craig, first supported the 63rd Pennsylvania Infantry in the Peach Orchard, and came under sharpshooter fire as soon as it reached its position. It was then placed between the Peach Orchard and the Klingel Farmhouse in support of the rest of the brigade. The regiment suffered under Confederate artillery fire, and took severe casualties when the Confederates from Lieutenant General James Longstreet's Corps attacked the Union position. The 105th Pennsylvania at first could not fire upon the Confederates, due to the fact that the soldiers of the 57th Pennsylvania Infantry were in their front. When that regiment moved forward, the 105th filled their place, firing upon the Confederate troops until the 57th Pennsylvania and 114th Pennsylvania fell back in retreat. The unit was the last one of its brigade to leave, making a slow, fighting withdrawal when the Confederates threatened to overwhelm it. It rallied with mixed survivors of its division, and counterattacked late in the day, recapturing (along with soldiers from others units) 3 abandoned artillery pieces from Battery C, 5th United States Artillery. The regiment then retired to the Union positions on Cemetery Ridge. On the Third day of the Battle, it was rushed to the center of the Union Line during Pickett's Charge to re-enforce the Vermont Brigade, but, other than taking artillery fire, it was not needed in the repulse of the Confederate assault. The 105th Pennsylvania, fielding 274 men at the start of the Battle, lost 19 killed or mortally wounded (including 2nd Lieutenants George W. Crossley of Company H and Isaac A. Dunsten of Company A) and 115 wounded or missing.