I need help on Halo 3 The Ark level: It is really peeing me off

Halo 3 and The Ark level, oh boy I have tried to do it - Ok so I am personally thick or something but hey you are either a true gamer or not and I have come to the conclusion I am not. I have been playing Halo 3 on the Xbox 360 and have really enjoyed it up till now; I will have to keep away from bad language here so I will do my best.
It is really peeing me off (I have many other word choices for peeing me off), I have go to the stage on the level called The Ark on Halo 3 where I meet up with six brutes in jet packs and one Brute Chieftain, I have tried at least 6 times now to beat this level and damn those Brutes they really do kick my ass.
Please my fellow Halo 3 gamers help me out and tell me what to do to complete this level so I can move onto the next.
Game is frigging awesome thou other than this setback.
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Leg it, keep moving, keep going up and down the ramps and behind pillars to recharge your shield.
stay around the edge and pick them off one by one. If you head into the middle to take them all on, you’ll die in about 3 seconds. My first 3 or 4 attempts were rubbish, but when I got the technique above nailed, it was quite easy.
Wait it out in a sheltered spot, they will come for you. Then you can take ‘em out one at a time.
Sorry, should of been more specific. At the top of the ramps are the sheltered spots I’m talking about. I did it first time on Heroic using the above.
And don’t use the gravity hammer - it’s best to keep as much disance as possible, until you’re down to the last couple at least.
Watch your language young man. Good Christian children say “bum”.
Dude Halo 3 sucks just quit now before u waste all ur time on such acrap game…it bad enough u waisted ur money like me and 10 billion other people!