This code breaks very often? Did I do something wrong or am I missing something?

void battle(){

srand(time(0));

if(turn == "Skeletons"){
    accuracy = rand()%100;
    if(accuracy > 60){

        humanHealth -= skeletonDamage;
        if(humanHealth <= 0){
            numOfHumans--;
            humansDead++;
            humanHealth = humanHealthBackup;
        }
    }
    turn = "Humans"; // I did turn == "Humans"
}

else if(turn == "Humans"){
    accuracy = rand()%100;

    if(accuracy > 60){
        std::cout << "Breakpoint1";
        skeletonHealth -= humanDamage; // I did on accident skeleton -= humanHealth xd
        if(skeletonHealth <= 0){
            numOfSkeletons--;
            skeletonsDead++;
            skeletonHealth = skeletonHealthBackup;
        }
    }
    turn = "Skeletons"; // I did turn == "Skeletons";
   }
}

From time to time this code tends to work, but more then often breaks. I could not really find anything wrong. I am just taking tutorials with MakingGamesWithBen on YouTube this is the first challenge he gave.

Aside from that, if someone could help me I'd appreciate it a lot.