The events in chronological order are:
a) Ancient Britain was invaded by wild barbarians.
b) Lord Uther drove the barbarians away.
c) Lord Uther died.
d) The Lords and knights began to fight for the kingdom.
e) The sword in the stone appeared in the churchyard.
f) Many knights tried to pull the sword out of the stone.
g) Arthur grew up in Sir Ector's house.
h) Sir Kay left his sword behind at home.
i) Arthur brought the sword from the churchyard.
j) Merlin entrusted a baby to Sir Ector.
k) Merlin announced that Arthur was the son of Lord Uther.