My Sparta 300/5 GOT OWNED :(

i did a heroic thing and lost my army on a 1 star... it was a army of 60 all lvl 2 and i lost, i believe they make it so you can never win -.-
i have to rebuild my army and im never ever gana do a heroic thing again. unless someone can tell me how to improve my success rate

I lost 70 soldier in a lv1 patrol , frustrating lol.
Today i will have 100 swordancer lv2( lv5 barrack), 100 heavy cavalry lv2 and 50+ Bowman lv2.
I have build the weapon and armor workshop and upgrade my swordancer and Heavy cavalry , they will have more defense and attack.
Heroic saga quest are unbalanced i think.

ahaha now i know im not the only one who got owed -.-
my sparta 300 shall live