You could split, but given their numbers, tactically speaking, they are going to turtle. However, these seem like the same quality of troops you faced last fight. Even 10 of them are not going to be much of a challenge if you get a charge in.
You could split up and try to surprise them, but that means no charge, and you may be spotted - knights on horseback are not very stealthy.
Another option, I suppose, would be for some of you to charge, while the rest go on a flanking move, but that seems riskier than putting everyone into a line and charging.
If you get good battle rolls and everyone is successful, you can charge through them, then come around for a second charge. If someone fails their attack, though, they'll get hung up and may get swarmed while you set up the second charge. But if you're going to set up a second charge, you're kind of committed going in.