Don't melee unless you're using protection prayers or you will be seriously hurt!
Troll generals can be attacked using a halberd from behind walls and rocks, so use the available safe spots and range or halberd the general. Don't get too close though, because this monster can pack a serious punch.
One of the Troll Generals.
Granite shield, Dragon spear, Shield left half.
Big bones (100%), Coins (20-350), Steel platebody, Earth runes (25-100), noted Raw tuna (4), Black warhammer, Grimy herbs, noted Coal (6), Adamant hatchet, Law runes (4), Death runes (25-80), Nature runes (16), Nature Talisman, Adamant sq shield, Steel Warhammer, Mithril Platebody, Uncut gems, Rune warhammer, Long bones, Gold charm, Green charm, Crimson charm, Blue charm