"Cadmean victory" meaning in English

{
  "etymology_text": "Probably referring to the battle in which the soldiers who sprang from the dragon's teeth sown by Cadmus slew each other.",
  "forms": [
    {
      "form": "Cadmean victories",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {},
      "expansion": "Cadmean victory (plural Cadmean victories)",
      "name": "en-noun"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "noun",
  "senses": [
    {
      "categories": [
        {
          "kind": "other",
          "name": "English entries with incorrect language header",
          "parents": [
            "Entries with incorrect language header",
            "Entry maintenance"
          ],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "Pages with 1 entry",
          "parents": [],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "Pages with entries",
          "parents": [],
          "source": "w"
        }
      ],
      "glosses": [
        "A victory that damages the victors as much as the vanquished."
      ],
      "id": "en-Cadmean_victory-en-noun-q6m1FyE5",
      "links": [
        [
          "victory",
          "victory"
        ],
        [
          "damage",
          "damage"
        ],
        [
          "victor",
          "victor"
        ],
        [
          "vanquished",
          "vanquished"
        ]
      ],
      "related": [
        {
          "word": "Pyrrhic victory"
        }
      ]
    }
  ],
  "word": "Cadmean victory"
}

{
  "etymology_text": "Probably referring to the battle in which the soldiers who sprang from the dragon's teeth sown by Cadmus slew each other.",
  "forms": [
    {
      "form": "Cadmean victories",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {},
      "expansion": "Cadmean victory (plural Cadmean victories)",
      "name": "en-noun"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "noun",
  "related": [
    {
      "word": "Pyrrhic victory"
    }
  ],
  "senses": [
    {
      "categories": [
        "English countable nouns",
        "English entries with incorrect language header",
        "English eponyms",
        "English lemmas",
        "English multiword terms",
        "English nouns",
        "Pages with 1 entry",
        "Pages with entries"
      ],
      "glosses": [
        "A victory that damages the victors as much as the vanquished."
      ],
      "links": [
        [
          "victory",
          "victory"
        ],
        [
          "damage",
          "damage"
        ],
        [
          "victor",
          "victor"
        ],
        [
          "vanquished",
          "vanquished"
        ]
      ]
    }
  ],
  "word": "Cadmean victory"
}