Thank you for the direction.
It seems that the Crop:Source filter uses the original dimensions of the imported video, which is vertical. When I apply both filters it rotates the video, then crops the center square with the vertical dimension of the original dimensions. It then enlarges it to touch the top and bottom. Unfortunately, this leaves a blank space on each side of the clip were the video was cropped away.
If there is any thing I should try beyond this try please let me know, but I really appreciate your help getting this far.