its funny though, i've seen dozens of times where a general died on impact, or even in the opening skirmishing. most often its in a heavy cav clash, though.

the levy celts are very much prone to insta-routs, especially the britons. but remember that the britons are set up with weak-morale and morale-bonus units, so their lower level guys need champions nearby or they will break upon receiving some heavy javelin fire.