User blog comment:OneofthePendragon94/Does someone know what happened to Morgana's mother Vivienne?/@comment-4650675-20130101204713/@comment-5674726-20130102133048

''He was always protective of those close to him and I still don't think that he didn't send the reinforces to Gorlois in order to abandon him. He seemed to be genuinely shocked when Morgana pretended to blame him about that.''

I wouldn't say that it was the first time that Morgana had accused Uther of responsibility for Gorlois' death. Uther denies responsibility before Morgana says anything to that effect so, either she'd accused him before or he was aware that she held him responsible and was anticipating the accusation. It's possible that it wasn't feasible to send reinforcements, depending on how far away Gorlois was fighting and the demands on resources at the time. I can't see Uther deliberately withholding help, especially since the battle Gorlois was fighting was presumably important for Camelot.

Morgana was just a child at the time. She lost a father she loved and her world suddenly changed so I'd say that it would be natural for her to want to be able to blame somebody for her loss. Perhaps she heard people talking about how the battle could have been won if Gorlois had had more men, latched on to the idea that Uther was responsible and never really let it go. Looking at the scene in question, I'd say that Uther was aware that Morgana blamed him but unaware of the details of her belief about him withholding reinforcements, since that part looked like it came as a shock to him.