Interesting responses.
You need to have LOS to charge.
Two units of flyers will almost always have problems alligning so the second can still pull of a charge
The keyword for setting up Warmaster terrain is LINEAIR OBSTACLES
Hmm, it seems to me that with Home-Back and LD10 there would be few issues of setting up a flank charge on a soft unit even in a battlefield packed with terrain on any turn following the first. As an additional bonus, even a failed order is unlikely to put the flyers in danger, unlike any other unit.
Try ignoring him and bashing on. Yes he may kill 3-4 units but if you can destroy 4-6 of my squishy bits in the meantime you're ahead. ie make a plan to kill my units and ignore the distraction, of course its easy for me to say!
Well, to be clear, he destroyed almost half my army break point single handed last game by turn 2, and was uninjured and in a position to achieve another flank charge into soft units on initiative. Had I not gone out of my way to kill him, I suspect the game would have ended much sooner.
Still 10+ S&S attacks is going to hurt
hmm... not convinced of the value of stand and shoot vs Dragon Rider. A unit of Cannons would have 4 stand-and-shoot shots, of which 2, on average, would hit - both of which are likely to be saved by a 3+ saving throw. Add in a Hellblaster, and assume the Dragon Rider is foolish enough to charge the cannon stand next to it, rather than the other, and you're looking at 10 shots (including cannons - assuming no hellblaster malfunctions). So figure 5 hits on average, and 3-4 saves from the Dragon Rider, leaving 1-2 unsaved if you're lucky. You lose a unit, possibly 2 or more if there's an advance charge once he pulverises your guns. He probably doesn't get injured and is free to wreck havoc havoc behind your lines and potentially doesn't even lose 1 off his army break point. Being on a hill would help, but, in my view, wouldn't change the outcome significantly - particularly if the elf magic is in force.
Also they are not unkillable
A lot of responses seem to imply I am thinking of Dragon Riders as a doomsday unit, but rather I simply question; in a game which is generally played to 'break-point' how one might deal with the dragon rider who seems able to inflict an unbalanced amount of damage*; or...
Original Question:
Can anyone provide advice to deal with it and not lose 4-8 units in the process?
And thanks to the good suggestions thus far; Wierd Enchantment, flagellant deterrent, cannon and hellblaster deterrent.
* Let me be clear; if we played warmaster on points like WFB, I think that it would be hard for a Dragon Rider to ever achieve an equal value.