Mika Jenkin's Sword and Scabbard

Origin
Mika Jenkins was a Union soldier during the Civil War. During one of the battles, his sword was damaged and his horse killed, but he emerged from the skirmish unharmed. He declared he was protected by the Hand of Providence, and cannot be killed by Yankee bullets. During another battle, a soldier with him picked up a discarded flag from the ground and Jenkins was shot in the head. Confederates, seeing the flag, thought the group were Yankees, and fired. Ultimately, Jenkins was not killed by Yankee bullets, but was killed by a Confederate shot.

Effects
This bifurcated artifact allows the user to become completely invincible to bullets. The sword, when held, allows user to escape unharmed from bullets belonging to Yankees (Northerner), but attracts Confederate (Southerner) bullets, which can harm the user. The scabbard, when used with the sword, protects the user from both sides' bullets.