No one makes a box of Vikings or Saxons on horseback. However, there are a couple germanic sets that stand in nicely. The grey horseman in the above photo comes from Hat's 8085 Gothic Cavalry. These are intended to be 4th century warriors, but the costume and equipment are pretty close to what you'd see in the 9th century. The red horseman is from MiniArt's 72013 Germanic Warriors. This is my first purchase from this company. The horses are kind of chunky, but the sculpting is very, very nice. I'm using the horsemen from this box as 9th century Saxons or Vikings. Whereas the foot models will be used as 4th century Saxon invaders to fight my Hat Late Romans. (I'm using these Hat's models as Arthurian Romano-British.)
Related radio program:
Check out The Viking Way series on BBC Radio 4. You can listen online to this program about the Vikings in Britain. They mention quite a few of the real-life characters featured in Cornwell's novels!