Campaign help 1250

[solidog]

I am playing the campaign "there is only war" with my guard army. I am playing against dark angels and orks I lost the first mission when I was invaded and lost my best planet (the campaign involves the rolling from a d3 of planets then invading each other each turn) I need to win this battle to gain a planet back. I am invading the dark Angels they have the best planet. The planet will be set up to be a very packed city scape with three main roads in to the middle just big enough for a tank with out side sponsors, then small allies filling the rest of the board only small enough for two guys wide. But then every bit of scenery scatters a d6 meaning the roads are not likely to stay there. The board deployment is set up as three rectangles only having to deploy 12" away from each other.

so this is my list for the battle I have to draw my units from a pre made 10000 point list that has to last me the campaign. 

Ccs
lascannon, regimental std, heavy flamer. 

Troops 
platoon 1

pcs heavy flamer 3x flamer
infanty squad melta
infantry squad melta

platoon 2 same as above 

platoon 3

pcs 4x melta
infantry squad melta 
infantry squad melta

amoured sentinel x3 all with heavy flamers one with argua array 

hellhound

scions x2 melta 

scions x2 melta 

vengeance weapon battery x2 punishers 

my my plan is to set the vengeance battery's so they have view down what ever alles are in my deployment with the hell hound as well giving me a nice wall of fire power to cover one side then hold back and flood the board late game. My sentinels will either out flank or support my troops and give my scions a no scatter deepstrike over a building to get to the back of dark Angels.

[solidog]

Please let me know what you think of my list and give ideas to what you would do. Thanks Solidog.

[howscat]

What does your opponent have in terms of units? This is Space Marines so AP3 is your friend. Take those Meltas off the scions and give them Volley guns. The tourox prime with its mini punisher and hot shot or, missiles with autocannon will tear threw marines and their transports while zipping threw the narrow streets. If you have any wyverns those re-rolls can make them accurate in small spaces and take down infantry. Dont forget it does not need line of sight!

[solidog]

I only run my scions in squads of five being Suicide squads I don't like to sink points in to them and being strength 3 still and needing fives to would I just don't find I get enough wounds through to make it a viable unit run with just hot shot. but he will more than likely be running whirlwinds so if I can not scatter due to me argua array and deep strike in behind I feel with the meltas I can cause some havoc. I don't have any turoxs I went to buy some when the scion start collecting formation came out because I love the sound of it but my shop shopped selling them to try and make you buy the box set money grabbing bastards so I brought me vengeance battery instead. I thought about wyverns but with the scenery scattering I'm worried I won't have enough room to put them any where so I went for a hell hound instead because it roasts orks like they are made of marshmallow lol. Do you think I would be better with wyverns and hope I have some room at the back? The trouble is as I found out in my last battle the deployment is only 12" apart so the orks are in charge range first turn, I had a lovely dug in force with blob squads protecting my artillery but with the first turn charge I was over run rather quickly and me artillery was no use to me hence why I have gone for straight up shoot and kill support for my troops in this battle. Do you think the vengeance is a good idea?