Enemies
Grunts
Grunts are the lowbiest of lowbie enemies. These foot soldiers for the Covenent are poorly armored and usually poorly armed, packing plasma pistols, needlers, and plasma grenades. (Late in the campaign you'll run across perhaps half a dozen Grunts that wield fuel rod guns, but they're very rare.) They're also quite cowardly, and will usually run in fear if you happen to kill the Brute that stands guard over their squad.
;)
Grunts come in different colors, which roughly denote their varied strengths. Even on Heroic difficulty, though, you're unlikely to notice any real difference in strength between the various Grunts, although there are rare gray Grunts that have significantly more health than the other types.
Some Grunts can be driven insane by the pressures of combat and will ignite plasma grenades in their hands and rush towards you. Shoot them before they get close, or they'll blow you to pieces.
Jackals
Jackals are the regulars of the Covenent army, and usually arrive in one of two forms. The rarer form is the sniper. These guys sit back on cliffsides and balconies in support of a Brute/Grunt squad, usually with a beam rifle or a carbine in their hands, and will take potshots at you. It's important for you to identify them and take them out before proceeding into combat with the squad they're attached to. Usually they'll start firing at you as soon as they're alerted to your presence. If you find yourself under fire from above, immediately backtrack to cover and start zooming in on the cliffs above you to find your adversary and shoot them.
More commonly, however, Jackals will appear with power shields in front of them and will fire on you from a narrow slit on the side, usually using a plasma pistol for the task. The shield will protect them from most damage, so killing them can be tough. If you can get close, landing a grenade anywhere near them will cause them to turn away, letting you fire on them. If you're using a precise weapon, however, you can actually aim at the firing hole on the right side (as you're viewing them). It's small, but you can hit it; a sniper rifle shot will kill them if you hit them here, and any other weapon hit will cause them to recoil, momentarily dropping their shields and allowing you to blast them with a headshot.
Brutes
Brutes are your primary foes throughout much of Halo 3. Although Grunts will be more numerous, Brutes will be more deadly. Although Brutes will possess a wide variety of weaponry, they all have one thing in common: body armor that will protect them from damage until it's removed. As with Elites in the previous Halo games, you need to knock this armor off (preferably with plasma-based weapons), then finish off the meat inside (preferably with bullets). One weapon in particular is great at taking down Brutes: the needler. If you can fire off a clip at most Brutes, they'll die right quick. Grenades also work well, especially the varieties that can stick onto your opponents, but then again, most Brutes will be good about diving away from your grenades.
;)
There are a few different varieties of Brutes, from the lowliest (usually clad in blue armor) to the toughest chieftans (armored with yellow plating). The lower ranks will often be found commaning squads of Grunts; if you can kill them, then their Grunt soldiers will often flee in disarray. Mid-level Brutes will usually be found in groups, and will be a formidable challenge; these groups are when you want to bust out your grenades or explosive weapons.
The chieftans are a breed apart; their yellow armor will prevent you from sticking plasma or Brute grenades onto them (they'll bounce right off), and they'll often wield powerful weapons like the gravity hammer, the fuel rod gun, or dismounted turrets. They'll also usually use the Invincibility equipment just before wading into battle, making them impossible to kill for ten or fifteen seconds or so. Nothing to do then but run away!
