Help with resistance

I'm on the final level of resistance: fall of man. where you have to 'shoot the rods' (spoken in a crappy scottish accent!) I cannot for the life of me, complete it!!! has anyone got any tips? can anyone help? I always die!!!
 
Refresh my memory and I can help. You have to activate something so the covers open up on blocking the rod/power-pole things right?Or do you have to shoot the covers off,then shoot the rod's? Havent played that in a year so refresh and be guided.
 
I never even got that far but I know there are like 2 levers you have to pull to lower shields all while getting shot at.
 
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