If you know the route you're going to escort it's good thought to travel it alone first killing all dangerouus around and
leaving corpses laying. It seems there is sometimes a creature or two supposed to spawn if you are escorting somebody, or so i guess, altogether very rare. Escorting somebody without it is just a pain (i'm not going to tell you where

) otherwise. Their bravery do not match their ability, and most often they are just blocking your directrise if you aren't lucky enough to finish the attacker with one hit. It's a bit better with later patches (or Bloodmoon) - the attackers tend to turn on PC if he's in the range of reach, alltogether it's not much of help if you're an archer or a mage. There's no ranged fighters on my memory among the escortable NPC.
Conjuration may help, too, altogether there is a long enough pause between the enconter starts and summoned minions discover the attacker. Not on the water, of course, the do not know how to waterwalk or to fly, even the Twilights.