User blog comment:Morganaforever/Morgana's torturer in 5x08/@comment-5674726-20121118161106

One thing that I hope they clarify is the timing of Morgana's capture.

We know that she was imprisoned for two years during the period of three to three and a half years (since Arthur and Guinevere celebrated the fourth anniversary of their marriage at the halfway point of Season Four) and that she was free for a minimum of three months by Arthur's Bane, Part 1. That potentially leaves a period of nine to fifteen months unaccounted for.

If she was captured immediately after The Sword in the Stone, Part 2, she kept a very low profile after her release, since it took a good year before anybody at Camelot knew what she was up to but if she was freed from captivity three months, or not much more than that, before Arthur's Bane, Part 1, then during the year, give or take a few months, after her defeat but before her capture, she didn't make a move against Arthur or Camelot.