2humans vs 6HammerAI and huge defeat

Hi,

my friend and I played a 2vs6 with a 20min treat thinking we could be ready and assault at least two or three of them and then start a simpler 2vs3 or 2vs4 but they beat us up a lot. And finally we quit.

what could be a strategy against so many HammerAI?

For sure we're not expert, but usually in playing a classical 4vs4 we have not problems at all.