Very good
Okay, first of all, this is a good flash. There is no doubt. However there are a few things you could work on to spare boredom.
You kept well to the madness theme and you did a very good job. I am glad your characters all fought in melee, it added character. The sounds where good and true to madness.
Flaws: It was frame-by-frame it appears. Which is never a bad thing, in fact it is good. Though your animation because of this was choppy and slow. Madness is supposed to be fast and animation smooth as a babies bum. So choppy animation.
Also, the tempo of the flash was very slow. It appeared that the frames were repeating just to extend the length of the flash. This is boring. Like the begining where they were rowing for about 15 seconds. Some of the tempo was fantastic, fast and exciting. Like when they charged the archers, that was perfect.
Of course not historically accurate with the helms nor the huge axes that were used in one hand. Though that doesn't matter, you created a kick ass Madness tribute using the same style.
8.5/10, which 'cause I'm awcward will be round up to 9/10. Not quite 10 (as I rarely do vote 10). Slow pace at certain parts and choppy animation reduces a 1.
Great flash and good luck for the future of animating.