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///<summary>We create a static string to allow us consistency.</summary>
string enemyTag = "Enemy";
///<summary>We can now use the tag to create an array of all enemy GameObjects.</summary>
GameObject[] enemies = GameObject.FindGameObjectsWithTag(enemyTag );
// We can now freely iterate through our array of enemies
foreach(GameObject enemy in enemies)
{
// Do something to each enemy (link up a reference, check for damage, etc.)
}