Are some monsters not hit-able.

[AxeMental]

Given the weapon and the size of the wielder, would some creatures be beyond realistic reach (even in a fantasy setting). For instance, would the halfling armed with a short sword be able to hit a large giant armed with a long spear or giant two handed sword. what about an ancient dragon, or a titan?

As DM I have in the past attempted to employ some of the formation rules (spears going first etc.) but haven't seen anything regarding monster size. Of course I'm lazy and would prefer someone here who knows the page reference to share it.

[Lord Cias]

Check out the picture at the bottom of page 173 of the DMG where it shows a halfling stabbing a giant (stone perhaps?) in the gut.

I believe part of this is already accounted for in the variable damage by size for weapons. Basically, long weapons do more damage vs. large creatures while short weapons do less.

[PapersAndPaychecks]

This is one of those things that AD&D "fudges" although not all systems do.

Picture the scene. On the one side, you have Fuchsia the Small, a female halfling fighter who is 2'6" tall but nevertheless has 50hp and is armed with a Shortsword of Giant Slaying. On the other side, you have Bjorn the Big, a 16' Frost Giant who is presently charging at Fuchsia while mounted on his trusty mammoth steed; he also has 50hp and is intent on smashing her into the ground with a club which would make a creditable telegraph pole.

In AD&D, they just roll to hit. It's quite possible for Fuchsia to decapitate her opponent; the physics of the situation are ignored in favour of gameplay.

In (for example) Runequest, Fuchsia might manage to stab her opponent in the knee before he crushes her into a bloody pulp.

AD&D is probably the RPG which sacrifices the most realism; you get flavour and streamlined gameplay instead.

[AxeMental]

I'm sure the reason EGG kept things from getting really big (think King Kong, or Godzilla) was to make sure ALL players had viable ways of dealing damage (not just MUs and fighters with arrows) to even the largest foe.

I just wanted to make sure I wasn't missing anything related to initiative (kind of the 3E reach thing...its amazing how much I have forgotten about 3E). The weapons length rule probably only applies to NPCs and armed monsters (a line of spear carrying orc) rather then monsters with long reach (a hill giant with a club)etc.