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A simple example.
Just recently, I attacked a level 111 Dungeon with 40 fake units and 4 air units against 50-99 zombies on dirt terrain. There turned out to be 6 stacks of 15 (unexpected). This battle took me 25-30 minutes because the zombies were mixed up, and to figure out which ones to retreat and which ones to leave, I had to use slow-motion graphics. Every single unit is valuable. The battle is really tough; any wrong click and you lose.
But with numbering, it would have taken a maximum of 10 minutes.
Just recently, I attacked a level 111 Dungeon with 40 fake units and 4 air units against 50-99 zombies on dirt terrain. There turned out to be 6 stacks of 15 (unexpected). This battle took me 25-30 minutes because the zombies were mixed up, and to figure out which ones to retreat and which ones to leave, I had to use slow-motion graphics. Every single unit is valuable. The battle is really tough; any wrong click and you lose.
But with numbering, it would have taken a maximum of 10 minutes.