This doesn't sound like the Mission 3 I know... Mission 3 is... *Possible Spoiler*

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Where you rescue Anders and Forge from the shrine thingy with 2 Grizzly Tanks. As far as I know, which is very far :), you're past Mission 3

You are on Mission: 04 - Arcadia City

And for Mission 4 Help. What you need to do to complete it is...

Have 4 Sets of Marines.  Two of them covering Transport Ship Number 1 and Two covering Number 2.

Have 4 Wolverines. Two of them covering Transport Ship Number 1 and Two covering Number 2.

Have a few Hornets (the 6 you have at the beginning are fine). The Hornets will guide the Civilians towards the ships.

Have 4 Warthogs. These Warthogs will also guide the Civilians towards the ships.

And the rest of your Pop. Cap. should go towards Scorpions... These Scorps will destroy the Covenant Base and stop the generation of annoying Wraiths and Hunters!

*Note: You cannot save Ship 3 as it auto blows up anyways

whoops yeah, sorry mission 4. the only problem is i guess that my hornets will be dead before i can make all those troops

any thoughts on that? 

should i get the second base too by the way?

hmm i don`t know if this as 100% right( i have played the mission) but the covenant turrets you mentioned are something the covenant are making at their base, if is a long range canon able to well blow up a ship at it sems.

ofc this is half guessing and half knowlege because i remember they saying something about that, but my tac for that mission where ATTACK so i kinda let the spartans save the ppl while i secured key points and assulted the covenant base (i failed the attack but managed the mission)