Mount&Blade/Rhodoks

The Rhodoks are an unusual faction; whereas the Khergits are cavalry-focussed the Rhodoks have only infantry and crossbowmen. Their spearmen have a combat advantage against cavalry but are only moderately useful against other infantry.

Against cavalry
If you have a mixed array of rhodock troops, then the best thing to do is to order your infantry ahead of hour crossbwman, ona hill this works much better, and as the cavalry approach, they will be knocked down by the heavy fire of crossbow bolts. Meanwhile, your rhodock infantry will have a very good chance in taking down the infantry without a problem, unless of course you are fighting a bunch or hired blades, with only a handful of spearmen.