Finally, he basically crawled into the den, with only his tail sticking out. I heard no sounds from the sow - no snorts or snarls. When the fox finally emerged, he did NOT have a cub in his mouth. I suspect that the sow hid the cubs under her and had a silent standoff with him.
Then, nothing much happened (the bears were snuggled in the den) until 4/10 - the day that the cubs decided that they wanted to go outside the den. However, mom didn't agree and kept pulling them back in. Here she is, resting between the 43 attempts that I counted of the cubs trying to escape!
All of this is included in a short video. You can watch it here or at Youtube. Although the scene appears quite bright through the trail cam lens - the lights were only infrared so the animals couldn't see them.
I sure hope that you enjoy it as much as I did! I love seeing the secret lives of our wildlife!