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https://youtube.com/watch?list=PLSdpZspNvMN5Hf45uXrQQ8uaGA70mNgST&v=jfDIz7M0p_Q
It's not necessary to lose 8 nymphs there. I took an average number of pirates, not the minimum, but there's one extra shot available, so it should work the same with 15 as well.
Max is a Necropolis hero with 3-0 attack, parameters, and an army of 12 pirates, 15 sailors, and 53 nymphs – 4 nymph losses.
Or 8-10 pirates, 21 sailors.