Why does the original Lady of the Lake carry a sword in the first place? Did she make it appear magically, or she just already had it?

Then the Lady of the Lake, who gave the new sword to Arthur, arrived in Camelot. The lady told Arthur that the sword was called Excalibur, and it was time, for the king to give the gift he had promised her. She wanted the head of Balin, for killing her brother, or the head of Lady Lile, for causing her father's death.

Explanation:

on the morning of  july 21,  1861, general mcdowell ordered the  unionarmy to attack. it was on this hill that  confederate  colonel thomas jackson and his forces held back theunion  troops.

because he didn't know how to do it