ok i was just laying siege to a greek city, i had over 1000 men and heavy onagers etc. but after smashing a few holes in their walls i decided i didnt have enough infantry to actually assault cos the enemy garrison outnumbered me. so i decided to withdraw get some heavy infantry from another province and attack agin. sadly it was not to be, when i withdrew from the siege my army left the field unpursued and in good order but when i got back to the main campaign map the entire army was DEAD!!!!!!!!!!!! WTF!