Tactics for the Swamp (Fortress).

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In general, it would be more ethical to confirm your calculations yourself, rather than simply stating that you have calculated something and asking others to disprove it. I tested it. The test was as follows:
The attacking hero has 6 stacks of 5 Rust Dragons each. The defending hero has 6 stacks of 10 Cows each. Battle order: all Dragons fly in, Cows attack; after 1 round, restart. Results: With 10 Cows, only 1 Dragon always died, or the gaze attack did not trigger (this is for those who thought that 10 Cows give 100%). Two deaths were not recorded. Then, I set 11 Cows. The number of deaths was strictly 0, 1, or 2. I couldn't tell the percentage ratio between 1 and 2 by eye; for this, I would have to record the results and conduct 1000 experiments. But the following is obvious:
1. 10 Cows can kill a maximum of 1 unit with their gaze.
2. 11 Cows can kill 1 or a maximum of 2 units.
3. Most likely, the numbers provided by AmberSoler are correct.

Number --- Chance to kill an opponent with a gaze
Gorgons ---1 unit--2 units--3 units--4 units

01-------10%
02-------19%
05-------41%
10-------65%
11-------68%---30%
15-------79%---45%
20-------88%---61%
21-------89%---63%---35%
25-------93%---73%---46%
30-------96%---81%---59%
31-------96%---83%---61%---37%
40-------98%---92%---77%---57%

4. The formula for the maximum number of units killed, n/10+1, is incorrect or requires some adjustment.
5. My hypothesis that the number of units killed is chosen randomly from the possible range is not confirmed, but also not refuted. For this, the results need to be recorded in writing.