ugh, i havnt beaten taht one. heres something that will help maybe (i play on MEDIUM difficulty, so yer milage may vary
at the beginning, you have some down time, so order ALPHA do defend the RAMANYANA and then BETA to defend the SOLACE (both are in yer escort list). stick around the SOLACE because 1 or 2 of those initial fighters will head straight at you, and you will not survive its barrage, or at least not go well with it. the gaganas seem to like killing off the SOLACE before they go to the RAMANYANA. once beta is dead (it will be soon) and DELTA shows up, order DELTA to defend the SOLACE. when the SOLACE is killed, order EVERYONE to defend the RAMANYANA. also, a wing of gaganas shows up on the right side about 4 kliks (IIRC) off the starboard side of the RAMANYANA, so go for those. they are loaded with those rapid-fire torps. there are no waves for those.
when GAMMA shows up, just tell them to engage enemy. they will slow them down for ya.
then, fly around and shoot at anything close to you. prioritize the GAGANAS, followed by the PEREGRINES, but beware of the CLAYMORES. they have gotten me many times...
when they jump in, ignore the 2 EA corvettes. they wont do
when the FREEDOM (lindos off in the distance) gets close, fire off at its beam cannons only if there are no bombers around. it will only take a few volleys from teh RAMANYANA to kill it.
when the EA destroyer jumps in, you have 1 minute to disarm it as well as you can. order EVERYONE to do so. its easily possible, as ive destroyed it in just 1 minute
so do that. once you have 3-4 of the cannons down, let yer wingmen finish it. go for any bombers that are around.
then, just wait for them to bug out.
thats what i did, and NOW i usually survive with ~80% hull and all ships except the solace alive. however, i usually have about 5 wingmen left, even after recieving LOTS of reinforcments, but i still get that far.
however, saving the independance is far beyond my skill so far. i either g et blasted with a nemisis beam, shot down by its missiles, or just cant disarm its starboard side in time.