"shock troop" meaning in English

{
  "etymology_templates": [
    {
      "args": {
        "1": "en",
        "2": "de",
        "3": "Stoßtrupp"
      },
      "expansion": "German Stoßtrupp",
      "name": "uder"
    }
  ],
  "etymology_text": "Loose calque of German Stoßtrupp.",
  "forms": [
    {
      "form": "shock troops",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {},
      "expansion": "shock troop (plural shock troops)",
      "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": "English undefined derivations",
          "parents": [
            "Undefined derivations",
            "Entry maintenance"
          ],
          "source": "w"
        }
      ],
      "glosses": [
        "A military formation created to lead an attack."
      ],
      "id": "en-shock_troop-en-noun-u-TpdRDZ",
      "links": [
        [
          "military",
          "military"
        ],
        [
          "formation",
          "formation"
        ],
        [
          "lead",
          "lead"
        ],
        [
          "attack",
          "attack"
        ]
      ],
      "wikipedia": [
        "shock troop"
      ]
    }
  ],
  "word": "shock troop"
}

{
  "etymology_templates": [
    {
      "args": {
        "1": "en",
        "2": "de",
        "3": "Stoßtrupp"
      },
      "expansion": "German Stoßtrupp",
      "name": "uder"
    }
  ],
  "etymology_text": "Loose calque of German Stoßtrupp.",
  "forms": [
    {
      "form": "shock troops",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {},
      "expansion": "shock troop (plural shock troops)",
      "name": "en-noun"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "noun",
  "senses": [
    {
      "categories": [
        "English countable nouns",
        "English entries with incorrect language header",
        "English lemmas",
        "English multiword terms",
        "English nouns",
        "English terms derived from German",
        "English undefined derivations"
      ],
      "glosses": [
        "A military formation created to lead an attack."
      ],
      "links": [
        [
          "military",
          "military"
        ],
        [
          "formation",
          "formation"
        ],
        [
          "lead",
          "lead"
        ],
        [
          "attack",
          "attack"
        ]
      ],
      "wikipedia": [
        "shock troop"
      ]
    }
  ],
  "word": "shock troop"
}