Seriously, it's too damn hard. The checkpoints are few and far in between, and the knights are just to OP. It's not even that I suck, because I beat Reach on legendary solo, it's just too damn hard.
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The A.I for the covies was airlifted from Reach so they aren't that hard. Just weapon toss anything usefull (Shotguns,Launchers,Power weapons etc) for the knights or just strafe them a suppressor. And don't waste your effort trying to keep Spartans alive unless you need them for a Warthog or something. They just rush in and get killed by needler grunts. [Edited on 11.19.2012 4:17 PM PST]