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In page Operation Sea Lion:

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Operation Sea Lion would have been the first ever amphibious invasion by a mechanised army, and the largest amphibious invasion since Gallipoli. The Germans had to invent and improvise much of equipment to be used, also proposing to use some new weapons and use upgrades of their existing equipment for the first time. These included:

  1. 48× Stug III Ausf B Assault Guns – 7.5 cm StuK 37 L/24, 50 mm armour and improved suspension. Some were to be landed with the first wave.[7]
  2. Panzer III F/G upgraded with more armour on the mantlet and progressively from 3.7 cm KwK 36 L/46.5 to 5 cm KwK 38 L/42.[citation needed]
  3. 72 Nebelwerfer, to be landed with the second and third waves.[8]