You have this option, you do not actually have to take part in battles as they are taken care of instantly. If you desire to minimize the number of losses, you can take part in them. This does take more time ... so your other option is to continuously re-train soldiers you have actually lost in battle. The good idea is that training is instantaneous in Legend: Rising Empire and you will probably have actually all the needed resources on hand. Do make sure to renew your troop counts after every 2-3 battles in order to get those easy wins and lose as couple of soldiers as possible.