"martel de fer" meaning in English

{
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      "expansion": "Old French",
      "name": "uder"
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  "etymology_text": "Old French, hammer of iron.",
  "forms": [
    {
      "form": "martels de fer",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
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      "args": {
        "1": "martels de fer"
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      "expansion": "martel de fer (plural martels de fer)",
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  "lang": "English",
  "lang_code": "en",
  "pos": "noun",
  "senses": [
    {
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          "kind": "other",
          "name": "English entries with incorrect language header",
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        {
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          "langcode": "en",
          "name": "Weapons",
          "orig": "en:Weapons",
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      "examples": [
        {
          "ref": "1846, Frederick William Fairholt, Costume in England: History",
          "text": "In addition to the sword and spear , the warrior occasionally wielded the martel-de-fer , a weapon combining a hammer and pick , and which did great execution among the armed knights , in breaking or dragging off the rings of the hauberk",
          "type": "quotation"
        }
      ],
      "glosses": [
        "A weapon resembling a hammer, often having one side of the head pointed, used by horsemen in the Middle Ages to break armour."
      ],
      "id": "en-martel_de_fer-en-noun-RXNY5J~l",
      "links": [
        [
          "weapon",
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        [
          "hammer",
          "hammer"
        ],
        [
          "horsemen",
          "horseman"
        ],
        [
          "Middle Ages",
          "Middle Ages"
        ],
        [
          "armour",
          "armour"
        ]
      ]
    }
  ],
  "word": "martel de fer"
}

{
  "etymology_templates": [
    {
      "args": {
        "1": "en",
        "2": "fro",
        "3": "-"
      },
      "expansion": "Old French",
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    }
  ],
  "etymology_text": "Old French, hammer of iron.",
  "forms": [
    {
      "form": "martels de fer",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {
        "1": "martels de fer"
      },
      "expansion": "martel de fer (plural martels de fer)",
      "name": "en-noun"
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  ],
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  "lang_code": "en",
  "pos": "noun",
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        {
          "ref": "1846, Frederick William Fairholt, Costume in England: History",
          "text": "In addition to the sword and spear , the warrior occasionally wielded the martel-de-fer , a weapon combining a hammer and pick , and which did great execution among the armed knights , in breaking or dragging off the rings of the hauberk",
          "type": "quotation"
        }
      ],
      "glosses": [
        "A weapon resembling a hammer, often having one side of the head pointed, used by horsemen in the Middle Ages to break armour."
      ],
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          "Middle Ages",
          "Middle Ages"
        ],
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          "armour",
          "armour"
        ]
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  "word": "martel de fer"
}