Hobnail
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In footwear, a hobnail is a short nail with a thick head used to increase the durability of boot soles or provide traction.
A pair of hobnailed boots
Roman hobnails were shoe tacks, a type of clinching nail; the narrowing tip was turned by a last held inside the sole as the nail was driven. So the tip did a U-turn back into the sole, clinching the nail in place.
Reconstruction of Ancient Roman caliga
Trench boot
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The trench boot, sometimes known as the "Pershing boot," was an American combat boot used in the latter stages of World War I, made for the cold mud of trench warfare.
Hobnail
…Examples include the caligae of the Roman military, the "ammo boot" in use by the British and Commonwealth armies from the 1860s and the US Army "trench boots" of World War I. Important design work for the modern hobnailed boot was done during World War I, e.g. the "Pershing boot" in the United States. Problems…
World War I soldier wearing "trench boots"