AuraSeer said:If more than a few are encountered, use Wall spells to split one or two off from the rest, and take them down before their fellows can rejoin them.
Oh, lord, this is effective. Played Halls of the Fire Giant King at the Ohio gameday. We set up a wall of force across most of the main hall, which trapped the king and kept him from escaping, prevented most of them from attacking us while we took on their front line, stopped all those nasty boulder tosses, and funnelled the second line into walking through a narrow gap betwixt force wall and the real wall, where they nicely lined up for a cone of cold. It was swell.
Side note: mirror image was handy dandy there too, several giants had readied boulders against spellcasters, and they took out some of my mirror images before I put up the wall of force, but didn't hit me. After that, the battle was practically over.
Heck, though, the wall tactic is probably valid against most any large group of enemies you might face.