I request tips on how to complete dome of light 6, scarab 7, beachhead 13, and escape 15 on heroic under par time.
The two achievements Adjudicate the Arbiter and Mr. Punctual are at stake for 45 gamerpoints.
I don't think they put much thought into their pars.

plenty of videos on youtube and other sites by now.

if it helps, for dome of light, get your units to the rhino locations ahead of time so covenant are destroyed when they spawn

for scarab, use scorpions with canister shells, destroy the nodes. hide ur tanks in the little alcove to the right of the scarab

for beachead, get vultures and u can plow through in no time

for escape, get odsts and vultures 

15 is easy, just get hawks as sonn as u can

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real strategy= I will sacrifice my bishop so I can take out his queen. Which will lure out his king. It is the perfect plan
Halo wars strategy= I will make 6 hogs and micro them around his base until I can get my 300 points, its the perfect plan

On beachhead there's a fine trick I found to get the scarab right from the beginning:

 

-Have just 1 spartan jack a wraith in the center covenant base.

-Do not send all your forces

-Cross the enemy base with that wraith(cannonfodder)

-When the wraith gets destroyed try not to lose your spartan and keep going to the scarab

-Once the spartan is near the scarab, pelican the rest of your forces to help you kill the flood guarding the scarab

-Jack the scarab and destroy the covie base.

 

(I did this on legendary so it'll defenitely work on heroic...)

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Gamebattle tournaments are BULLSH-IT it should be GayBattles instead...

request LT Shotgun to be friend with you because it hard to do it on solo

Mission 6: Dome of Light

1. Never let your population go above 15 - if you do, the Covenant send in an overwhelming force
2. Get 4 Scorpions, stick a Spartan in each and use that to take down outpost at position 2 and retreat
3. Send Rhino #3 into position by itself - it can take out local forces before moving into position
4. Use Pelicans to quickly and safely get your Rhinos to ALL positions except #1
5. As already noted, if you time it right you can be sitting on the ramp near position #4 to quickly take out both Locusts and the outpost when it appears
6. Speed is the key on this level - to finish on Heroic or Legendary you almost have to be under par!

Mission 7: Super Scarab (easiest of the 4 listed here)

1. Scorpions work best
2. Take out power nodes in central part of map to slow/weaken Scarab
3. Ignore power nodes on left side of map completely
4. Use MAC to assist with Locust/node takedown
5. Use Rail Gun turrets at base to defend Locust attacks

Mission 13: Beachhead

1. Take out base to the south of the last LZ first - jack the Locust with a Spartan to make it easier
2. Remember to stick infantry in supply hook near base!
3. Use Spartans (and others) to defend while you build up base
4. Build Hornets and upgrade
5. Move forces up to take out central base - jack Locust again, but remember to leave at least one Spartan to jack the Scarab later
6. Start building base but quickly move on the take Scarab
7. Take out base #3 near Scarab
8. Start building base again but move hornets on up to final base, while simultaneoulsy sending Scarab and other ground forces up the ramp to teleporter

Mission 15: Escape

1. Immediately claim supply hooks to left and right
2. Open interlock in front of base
3. Build Hornets (and upgrade ASAP to Hawks)
4. Carefully fly around to opposite interlock and open (dropping Scarab #1 in process)
5. Continue building Hornets/Hawks and move on to Interlock to the right of your base (Flood)
6. Clear away Flood and open
7. Continue around in counter-clockwise fashion opening interlocks as you go
8. Use MAC/Ice/Carpet to soften up Scarabs and any other troublesome forces out on the portal
9. You should not have to completely detroy the Covenant base before opening the last interlock

GO TO YOU TUBE AND SERCH NEXT GEN WALK THROUGH HALO WARS.

THAY HELPED ME. 

like it has been said go for air when you can. hawks own. beachhead: get hornets, fly them to the scarab, pelican in a spartan, take it and wreck. keep building hornets and upgrading them, destroy the air pad things that are around the map. and just use the scarab for everything. keep some hornets around for the elites that it has trouble targeting. keep in mind that you can use the transporter with the scarab. once you get it to 3 stars it is unstoppable.