NEVER use speed troops (Swift Strike) with ranged troops (longbowmen). That’s horrible advice. They’ll kill each other.
For level five camps, you should have ten thousand swift strike dragons (train metallurgy to 5, medicine to 4, and dragonry to 6). OR (not AND, do NOT use them together) use at least 4000 longbowmen, although more would be better, and 100 armored transports (train metallurgy to 6, medicine to 4, and weapons calibration to 7).