Guarding Valuable Freight [6] is much harder than is implied. instead of instant attack, waves do not appear till after you do another battle on the gungls in the area (try fighting a lot of joiners then having to kill 3 more fights without rest). then the text says repel three attacks but is really 3 waves of 3 attacks (1-3 monsters each fight). at least you can rest up between each wave.