// NOW DO BATTLE
$attackrolls = array(0,0,0);
if($_SESSION['game_rolls'] == 3){
$defendrolls = array(0,0,0);
}else{
$defendrolls = array(0,0);}

// reset Session data
$_SESSION['defend_rolls'] = $defendrolls;
$_SESSION['attack_rolls'] = $attackrolls;

// generate first roll
$defendrolls[0] = mt_rand(1,6);
$attackrolls[0] = mt_rand(1,6);

// generate additional rolls if necessary
if($opposing_armies > 1){
   $defendrolls[1] = mt_rand(1,6); // default defend with 2 which is max if there are 2
    if($opposing_armies > 2 && $_SESSION['game_rolls'] == 3) {
    $defendrolls[2] = mt_rand(1,6); // generate 3rd defensive roll
   }
   }
if($attacking_armies > 1){
   $attackrolls[1] = mt_rand(1,6); // generate 2nd attack roll
   if($attacking_armies > 2)
      $attackrolls[2] = mt_rand(1,6); // generate 3rd attack roll
}

rsort($attackrolls); // sort highest to lowest
rsort($defendrolls);

// Save the die rolls as Session data
$_SESSION['defend_rolls'] = $defendrolls;
$_SESSION['attack_rolls'] = $attackrolls;

$attackcasualties = 0;
$defendcasualties = 0;
if($_SESSION['game_rolls'] == 3){
$fighters = 1; // keeps track of what rolls are fighting, subtract 1 to get at correct array index
while($fighters <= 3 && $fighters <= $opposing_armies && $fighters <= $attacking_armies){ // to keep 0's from engaging // 2 instead of attack armies cause
   if($attackrolls[$fighters-1] > $defendrolls[$fighters-1])   // you cant have 3 fighting ever in Risk
      $defendcasualties -= 1;
   else
      $attackcasualties -= 1;
   $fighters++;
  }
}else{
$fighters = 1; // keeps track of what rolls are fighting, subtract 1 to get at correct array index
while($fighters <= 2 && $fighters <= $opposing_armies && $fighters <= $attacking_armies){ // to keep 0's from engaging // 2 instead of attack armies cause
   if($attackrolls[$fighters-1] > $defendrolls[$fighters-1])   // you cant have 3 fighting ever in Risk
      $defendcasualties -= 1;
   else
      $attackcasualties -= 1;
   $fighters++;
  }
}