What should Turks and Vikings do vs Mayans and Indians in Imperial Age?

Hi. I’m only a 1750 player on hd so maybe this is obvious.

In 4v4 Arabia, if Indians get to Imperial Camels and trebs, Mayans get to Elite Plumes and Eagles, in theory what should the Turks and Vikings do? Preferably other than die.

In reality, we chose die. We tried to do damage in castle to avoid this situation and although we did enough for a score lead it wasn’t enough to win. Then we didn’t have the eco/time to make expensive switches like onager, hc or berserks.

Thanks for any advice!