Of course attrition is a real concern in an adventure. The Hydra battle was barely a win and those 2 survivors would have had to avoid any encounters get back out to safety. An Ogre battle or any with multiple high HP, high Damage can always end in a party wipe if the dice and not on the players side.
the Pale, Elf Hero/Spellbinder (MV 12", AC 9, HD 4/2, hp 11/11, FC Hero, L) helm, bow[/f]
Sorefoot, Hobbet Thief (Lv: 4 AC: 5 Hp 12) Leather+Shield+Dagger, Sling[/f]
(Hobbet Varlet, MV 9′′, AC 7, HD 2, hp 8, FC 2 men, SV T7, N)[/f]