Did they have good drainage? If so, a lot of rain would just pass through the soil and out the bottom. I suppose continual rain could stress the plants and make them struggle to breathe, but I'd give them some time and maybe a small amount of fertilizer after they've dried out some. With that much wash-out, you may have lost all the fertilizer you planted them with.

I would, however, do something to prevent any more rain from watering the container soil. Plastic around the plant with soil heaped in the middle so rain will run off? And make sure you have adequate drainage, even if you have to drill more holes -- even with heavy rain, you shouldn't have had water "brimming" on the pots.

How are they doing now? I am contemplating putting a few inches of bark at the bottom of my potting mix when I plant, so that if it gets really sloppy, the roots can reach down there for oxygen.